This document summarizes the design and operation of low-profile cross-ventilated (LPCV) dairy barns. LPCV barns merge multiple rows of freestalls under one roof to increase housing capacity while reducing space needs compared to conventional barns. The barns use fans, baffles, and evaporative panels or spray systems to provide constant cross-ventilation. Studies have found that LPCV barns can house more cows while improving cow comfort compared to other housing types. Ammonia and hydrogen sulfide levels are generally lower than in conventional barns but higher than some alternative housing.
El documento describe los diferentes tipos de gráficas estadísticas y sus elementos. Explica gráficos de columnas, líneas, circulares, de barras, de área, de dispersión, de superficie, de anillos y radiales. Luego presenta un ejercicio sobre los sabores de jugo más vendidos en una universidad, con una tabla de frecuencias y gráficos como histograma y polígono de frecuencia que muestran que el 39% prefiere jugo de limón.
El documento describe algunas ventajas del internet como facilitar la comunicación global y el acceso a información de diferentes fuentes, pero también señala algunas desventajas como la dependencia de la electricidad y procesos que pueden detenerse si hay cortes, además de problemas relacionados con spam, malware y phishing.
Мы пригласили опытного руководителя отдела маркетинга, который расскажет о том, как выстроить взаимодействие HR и маркетинга, как продуктивно выстроить отношение между отделом маркетинга и отделом HR, и как HR может напрямую влиять на прибыль компании при тесном взаимодействии с отделом маркетинга.
Сайт проекта: http://hredu.ru
Facebook: http://facebook.com/hreduru
LinkedIn: https://www.linkedin.com/company/hredu-ru/
El documento describe los diferentes tipos de gráficas estadísticas y sus elementos. Explica gráficos de columnas, líneas, circulares, de barras, de área, de dispersión, de superficie, de anillos y radiales. Luego presenta un ejercicio sobre los sabores de jugo más vendidos en una universidad, con una tabla de frecuencias y gráficos como histograma y polígono de frecuencia que muestran que el 39% prefiere jugo de limón.
El documento describe algunas ventajas del internet como facilitar la comunicación global y el acceso a información de diferentes fuentes, pero también señala algunas desventajas como la dependencia de la electricidad y procesos que pueden detenerse si hay cortes, además de problemas relacionados con spam, malware y phishing.
Мы пригласили опытного руководителя отдела маркетинга, который расскажет о том, как выстроить взаимодействие HR и маркетинга, как продуктивно выстроить отношение между отделом маркетинга и отделом HR, и как HR может напрямую влиять на прибыль компании при тесном взаимодействии с отделом маркетинга.
Сайт проекта: http://hredu.ru
Facebook: http://facebook.com/hreduru
LinkedIn: https://www.linkedin.com/company/hredu-ru/
Veggie Alarm is a conceptual design that uses mobile technology to encourage college students to develop the habit of eating vegetables every day. It works by having users set a repeating alarm on their phone for 30 minutes after they usually get home from class or lab. When the alarm goes off, they are reminded to eat the raw vegetable they previously selected and have on hand, like baby carrots. The design is meant to be simple, fitting into users' schedules by triggering in the evening when vegetables are available. It will be tested by recruiting friends to participate for five days and collecting survey feedback.
This document discusses how video analytics can provide insights into shopper behavior by analyzing security camera footage. It proposes that a company called IDEOtics uses computer vision and machine learning to extract data on metrics like foot traffic, time spent in areas, and customer interactions. This data would then be analyzed to provide retailers with weekly dashboards and quarterly reports containing recommendations on how to increase sales and efficiency based on tracked shopper behaviors. Implementing these recommendations could potentially lead to an annual revenue increase of up to 8% for retailers.
This document introduces Gravr, a service that allows users to create personalized avatars for use in virtual reality experiences on the web. It provides examples of how Gravr avatars could be used by individuals in different scenarios, such as car shopping, playing online games, or watching movies. Developers can use the Gravr API to integrate avatar functionality into their VR applications and better understand their users.
El documento describe la importancia de proteger las fuentes de abastecimiento de agua, ya que de ello depende la calidad del agua consumida por la población. Se mencionan diversas fuentes como ríos, manantiales, pozos y lagos, y se señala que es necesario vigilar la calidad del agua en los sistemas de abastecimiento y promover el lavado y desinfección de depósitos para prevenir enfermedades. También se destaca la importancia del diagnóstico de saneamiento básico para identificar factores de
Видео вебинара: http://youtu.be/MqsgMk3amgQ
Екатерина Илларионова рассказала об особенностях кадровой работы для руководителя и что должен делать руководитель, чтобы быть защищенным при возникновении трудовых споров.
Сайт проекта: http://hredu.ru
Страница проекта в Facebook: https://www.facebook.com/hreduru/
Страница проекта в LinkedIn: https://www.linkedin.com/company/hredu-ru
#hredu #ГКАлмаз
The document describes various techniques for evacuating injured casualties from an emergency scene, including carries, drags, and makeshift stretchers. It emphasizes the importance of carefully handling casualties to prevent further injury, choosing the least stressful technique based on the situation, and moving deliberately to avoid harming the rescuer or victim. Various carries and drags are outlined, such as the one-person arm carry, two-person drag, chair carry, ankle pull, and improvised stretchers using clothing, blankets, or rope.
Презентация онлайн-курса "Технология создания игр для бизнеса", который пройдет с 1 марта по 25 мая 2017 года. Технология создания игр для бизнеса - онлайн-курс для тех, кто хочет решать задачи бизнеса с помощью игровых решений: знакомство с бизнес-процессами компании, создание команды, управление конфликтами, настройка коммуникаций, создание и развитие клиентского сервиса, и т.д.
This document provides information about aquaponics systems. It discusses various components of aquaponics systems including grow beds, fish tanks, filters, pumps, and plant media heights. Different types of pumps used in aquaponics are described, such as airlift pumps, swirl filters, and bell siphons. Examples of small hobby, backyard, and commercial aquaponics systems are shown through diagrams and pictures. Sources for further information on aquaponics are provided.
This document discusses design guidelines for propylene splitters. It begins with an introduction to factors that affect tower efficiency like pressure, geometry, flow rates, and compositions. It then discusses typical field efficiencies for different tower types based on published data. The document reviews how pressure, viscosity, and volatility affect efficiency based on O'Connell correlations. It also discusses the effects of pressure on tray and packing efficiencies. The document concludes with discussions on best practices for tray and splitter design and considerations for high versus low pressure splitters.
(pens and stall barns) in dairy buildingJassica Karen
Pens are enclosures for livestock that vary in construction and terminology depending on region. Pen design depends on factors like the size and feeding of cattle as well as climate. Space requirements include area for each animal, with more space needed in wetter climates or flatter land. Stall barns provide space for cattle and machinery traffic while promoting drainage and using quality components. Low-profile cross-ventilated barns merge conventional freestall barns under one roof to eliminate space between, increasing air flow toward stalls. Selection of housing depends on costs, animal comfort, worker efficiency, durability and return on investment.
Farm building (MEHRAN GUJJAR AGRI ENGR)Mehran Iqbal
Housing is an important factor in dairy farming that depends on the number of animals, breed, environment, finances, and facilities. There are three main types of housing: free stall, tie stall, and loose housing. Free stall is recommended and involves dividing the area into stalls/cubicles where cows can enter and exit freely except during milking. Tie stall confines cows to individual stalls and is not preferred. Loose housing does not provide stalls and is difficult to manage animals. Housing should meet animal needs and allow for expansion if required.
Grain Pumps have proven to be excellent long life systems. The largest members in the Global Industries’ Grain Pump® family are the Grain Pump® Loop and Double Run Systems, which are designed and manufactured by Hutchinson, a Division of Global Industries, Inc., located in Clay Center, KS-USA
There are several types of supply duct systems that can be used for residential structures. The main types include radial, extended plenum, reducing plenum, reducing trunk, and perimeter loop systems. The optimal system depends on factors like the structure layout and winter design temperature. Ducts can be placed in attics, basements, between floors, crawl spaces, or within conditioned spaces. Proper installation methods are needed to prevent issues like condensation, leakage, and pressure losses. Short duct runs and conditioned space installations are generally preferable.
This document summarizes the sawdust pulping process at Mackenzie Operations, including:
- The strategic importance of sawdust pulping, which consumes 220,000 bone dry units of sawdust per year that would otherwise be burned.
- The key equipment used, including the Andritz-Bauer M&D digester, sawdust storage bins, metering screw, and rotary valve that preheats and feeds sawdust into the digester at high pressure.
- Details on the rotary valve design and operation, which performs multiple functions to preheat, pressurize and feed sawdust into the digester in a continuous process.
Radiant cooling systems circulate cool water through ceiling, wall, or floor panels to absorb heat from occupants and interior spaces. They are more efficient and comfortable than traditional air circulation systems. Radiant cooling systems have comparable initial costs but provide lifetime energy savings of 5-30% over air systems due to water's higher heat transfer capacity. This document describes the components, design, and benefits of a radiant cooling system installed in an office building in Delhi, India. Experimental results found the radiant system saved 17-26% more energy than a traditional variable air volume system.
Demonstration of equipment used at a poultry farmADEEL ARSHAD
This document describes various types of equipment used at poultry farms, including brooding, lighting, feeding, watering, ventilation, and miscellaneous equipment. It provides details on common equipment such as brooders, feeders, drinkers, fans, and discusses their specifications and uses in poultry farming.
This module provides information on setting up a hatchery facility for fish propagation. It covers designing hatchery tanks, evaluating suitable sites, and constructing tanks. The key components discussed are laying out the hatchery using an appropriate scale, selecting tank sizes and shapes based on fish species and financial resources, and including necessary production and life support units. Sample hatchery layouts include larval rearing tanks, rotifer tanks, microalgal tanks, sand filters, and water storage. The module aims to teach students the skills needed to independently design and construct a functional hatchery.
Veggie Alarm is a conceptual design that uses mobile technology to encourage college students to develop the habit of eating vegetables every day. It works by having users set a repeating alarm on their phone for 30 minutes after they usually get home from class or lab. When the alarm goes off, they are reminded to eat the raw vegetable they previously selected and have on hand, like baby carrots. The design is meant to be simple, fitting into users' schedules by triggering in the evening when vegetables are available. It will be tested by recruiting friends to participate for five days and collecting survey feedback.
This document discusses how video analytics can provide insights into shopper behavior by analyzing security camera footage. It proposes that a company called IDEOtics uses computer vision and machine learning to extract data on metrics like foot traffic, time spent in areas, and customer interactions. This data would then be analyzed to provide retailers with weekly dashboards and quarterly reports containing recommendations on how to increase sales and efficiency based on tracked shopper behaviors. Implementing these recommendations could potentially lead to an annual revenue increase of up to 8% for retailers.
This document introduces Gravr, a service that allows users to create personalized avatars for use in virtual reality experiences on the web. It provides examples of how Gravr avatars could be used by individuals in different scenarios, such as car shopping, playing online games, or watching movies. Developers can use the Gravr API to integrate avatar functionality into their VR applications and better understand their users.
El documento describe la importancia de proteger las fuentes de abastecimiento de agua, ya que de ello depende la calidad del agua consumida por la población. Se mencionan diversas fuentes como ríos, manantiales, pozos y lagos, y se señala que es necesario vigilar la calidad del agua en los sistemas de abastecimiento y promover el lavado y desinfección de depósitos para prevenir enfermedades. También se destaca la importancia del diagnóstico de saneamiento básico para identificar factores de
Видео вебинара: http://youtu.be/MqsgMk3amgQ
Екатерина Илларионова рассказала об особенностях кадровой работы для руководителя и что должен делать руководитель, чтобы быть защищенным при возникновении трудовых споров.
Сайт проекта: http://hredu.ru
Страница проекта в Facebook: https://www.facebook.com/hreduru/
Страница проекта в LinkedIn: https://www.linkedin.com/company/hredu-ru
#hredu #ГКАлмаз
The document describes various techniques for evacuating injured casualties from an emergency scene, including carries, drags, and makeshift stretchers. It emphasizes the importance of carefully handling casualties to prevent further injury, choosing the least stressful technique based on the situation, and moving deliberately to avoid harming the rescuer or victim. Various carries and drags are outlined, such as the one-person arm carry, two-person drag, chair carry, ankle pull, and improvised stretchers using clothing, blankets, or rope.
Презентация онлайн-курса "Технология создания игр для бизнеса", который пройдет с 1 марта по 25 мая 2017 года. Технология создания игр для бизнеса - онлайн-курс для тех, кто хочет решать задачи бизнеса с помощью игровых решений: знакомство с бизнес-процессами компании, создание команды, управление конфликтами, настройка коммуникаций, создание и развитие клиентского сервиса, и т.д.
This document provides information about aquaponics systems. It discusses various components of aquaponics systems including grow beds, fish tanks, filters, pumps, and plant media heights. Different types of pumps used in aquaponics are described, such as airlift pumps, swirl filters, and bell siphons. Examples of small hobby, backyard, and commercial aquaponics systems are shown through diagrams and pictures. Sources for further information on aquaponics are provided.
This document discusses design guidelines for propylene splitters. It begins with an introduction to factors that affect tower efficiency like pressure, geometry, flow rates, and compositions. It then discusses typical field efficiencies for different tower types based on published data. The document reviews how pressure, viscosity, and volatility affect efficiency based on O'Connell correlations. It also discusses the effects of pressure on tray and packing efficiencies. The document concludes with discussions on best practices for tray and splitter design and considerations for high versus low pressure splitters.
(pens and stall barns) in dairy buildingJassica Karen
Pens are enclosures for livestock that vary in construction and terminology depending on region. Pen design depends on factors like the size and feeding of cattle as well as climate. Space requirements include area for each animal, with more space needed in wetter climates or flatter land. Stall barns provide space for cattle and machinery traffic while promoting drainage and using quality components. Low-profile cross-ventilated barns merge conventional freestall barns under one roof to eliminate space between, increasing air flow toward stalls. Selection of housing depends on costs, animal comfort, worker efficiency, durability and return on investment.
Farm building (MEHRAN GUJJAR AGRI ENGR)Mehran Iqbal
Housing is an important factor in dairy farming that depends on the number of animals, breed, environment, finances, and facilities. There are three main types of housing: free stall, tie stall, and loose housing. Free stall is recommended and involves dividing the area into stalls/cubicles where cows can enter and exit freely except during milking. Tie stall confines cows to individual stalls and is not preferred. Loose housing does not provide stalls and is difficult to manage animals. Housing should meet animal needs and allow for expansion if required.
Grain Pumps have proven to be excellent long life systems. The largest members in the Global Industries’ Grain Pump® family are the Grain Pump® Loop and Double Run Systems, which are designed and manufactured by Hutchinson, a Division of Global Industries, Inc., located in Clay Center, KS-USA
There are several types of supply duct systems that can be used for residential structures. The main types include radial, extended plenum, reducing plenum, reducing trunk, and perimeter loop systems. The optimal system depends on factors like the structure layout and winter design temperature. Ducts can be placed in attics, basements, between floors, crawl spaces, or within conditioned spaces. Proper installation methods are needed to prevent issues like condensation, leakage, and pressure losses. Short duct runs and conditioned space installations are generally preferable.
This document summarizes the sawdust pulping process at Mackenzie Operations, including:
- The strategic importance of sawdust pulping, which consumes 220,000 bone dry units of sawdust per year that would otherwise be burned.
- The key equipment used, including the Andritz-Bauer M&D digester, sawdust storage bins, metering screw, and rotary valve that preheats and feeds sawdust into the digester at high pressure.
- Details on the rotary valve design and operation, which performs multiple functions to preheat, pressurize and feed sawdust into the digester in a continuous process.
Radiant cooling systems circulate cool water through ceiling, wall, or floor panels to absorb heat from occupants and interior spaces. They are more efficient and comfortable than traditional air circulation systems. Radiant cooling systems have comparable initial costs but provide lifetime energy savings of 5-30% over air systems due to water's higher heat transfer capacity. This document describes the components, design, and benefits of a radiant cooling system installed in an office building in Delhi, India. Experimental results found the radiant system saved 17-26% more energy than a traditional variable air volume system.
Demonstration of equipment used at a poultry farmADEEL ARSHAD
This document describes various types of equipment used at poultry farms, including brooding, lighting, feeding, watering, ventilation, and miscellaneous equipment. It provides details on common equipment such as brooders, feeders, drinkers, fans, and discusses their specifications and uses in poultry farming.
This module provides information on setting up a hatchery facility for fish propagation. It covers designing hatchery tanks, evaluating suitable sites, and constructing tanks. The key components discussed are laying out the hatchery using an appropriate scale, selecting tank sizes and shapes based on fish species and financial resources, and including necessary production and life support units. Sample hatchery layouts include larval rearing tanks, rotifer tanks, microalgal tanks, sand filters, and water storage. The module aims to teach students the skills needed to independently design and construct a functional hatchery.
The document discusses various aspects of distillation column design including tray types, sizing considerations, flooding, efficiency, and special design features. It provides details on perforated, valve, bubble cap, and chimney trays as well as concepts like weir loading, distribution, and orientation of components. Tray selection depends on factors like volatility, thermal stability, corrosion resistance, and desired throughput. Proper design aims to maximize capacity while avoiding issues that could reduce efficiency or damage equipment during start-up.
Taco CA expansion tanks provide air and water separation using a durable bladder. They are available in various sizes and capacities. CA tanks reduce expansion tank sizes by up to 80% compared to traditional steel tanks by using a bladder to separate air and water. This allows them to be pre-charged to the system pressure without needing initial water to compress air. CA tanks improve system performance by better controlling pressure and eliminating air issues.
Similar to Cross ventilated barns for dairy cows: New building design with cow comfort in mind (13)
Mejora de la rentabilidad mediante la producción de grasa lácteaFernando Diaz
El documento discute el costo de la alimentación en la producción lechera intensiva en los Estados Unidos. Según el USDA, la alimentación representó el 50.4% del costo total de producción de leche en 2015. La grasa láctea es el componente más fácilmente manipulable con la dieta y su producción puede mejorar los ingresos, ya que el precio de la grasa láctea es variable. Estrategias alimenticias enfocadas en reducir el costo de la dieta y aumentar la producción de grasa pueden maximizar los ingresos
Efectos de las enzimas fibrolíticas sobre la producción de componentes lácteosFernando Diaz
La adición de enzimas fibrolíticas a las dietas de vacas lecheras ha mostrado resultados inconsistentes en cuanto a su efecto sobre la producción de componentes lácteos. Sólo 3 de 20 estudios encontraron un aumento en la producción de grasa láctea, mientras que 4 de 20 estudiaron un incremento en la producción de proteína láctea. Estos aumentos se debieron principalmente a mejoras en la producción de leche o concentración de componentes, más que a cambios en la fermentación ruminal. El uso de enzimas no ha demostrado
Uso de concentrados proteicos nacionales en dietas de rumiantesFernando Diaz
La harina de soja es el complemento proteico más utilizado en las dietas de rumiantes, pero España depende completamente de las importaciones de soja. La harina de girasol y el guisante de primavera producidos en España pueden ser buenas alternativas, ya que la harina de girasol es deficitaria en lisina pero rica en otros aminoácidos, mientras que el guisante es deficitaria en otros aminoácidos pero rica en lisina. El tratamiento combinado de estas harinas con ácidos y calor puede aumentar la fracción de proteí
Improving dairy cow performance with fiber-degrading enzymesFernando Diaz
The document summarizes several studies that examined the effects of adding fiber-degrading enzymes to dairy cow feed. The studies found mixed results, with some showing improved feed efficiency from lower intake without affecting milk production. Others found reduced efficiency or no effects. Effects on body weight and reserves were also negligible in most studies. The inconsistency may be due to differences in diet composition and enzyme dosage. More research is needed to identify optimal uses of these enzymes for dairy production.
This literature review examined experiments where dairy cow milk production benefited from fiber-degrading enzymes. The average milk yield increase was 5.5 lbs/day, though results varied widely from 2.6 to 13.9 lbs/day more. The response depended on enzyme dosage, combination, and application method. Some studies found low dosages increased milk but high dosages did not, possibly due to negative feedback or reduced rumen pH. Optimal concentrations need to be determined, as under- or overfeeding enzymes affects results. Enzyme combinations and application portion, such as concentrate vs total mixed ration, also influenced outcomes. Milk fat and protein sometimes increased as well, though not consistently across experiments.
Importancia de la calidad en los forrajes en dietasFernando Diaz
1) El documento discute la importancia de la calidad de los forrajes en dietas de alta producción para vacas lecheras. 2) Estudios mostraron que vacas alimentadas con dietas altas en forraje tuvieron menores consumos y producción de leche debido a que las fibras de los forrajes permanecen más tiempo en el rumen. 3) La calidad del ensilado de maíz, especialmente la digestibilidad de su almidón, afecta significativamente la producción de leche al aportar más proteína metabolizable a la dieta
Efectos del ácido málico en dietas de vacas lecherasFernando Diaz
Malic acid is an organic acid found naturally in many forages that can improve rumen fermentation. While in vitro studies have shown positive effects of malic acid supplementation, in vivo studies on dairy cows have found inconsistent results on milk production. More research is needed to evaluate the effects of malic acid supplementation on dairy cow performance and health, and determine the optimal dose in dairy cow diets.
Milk fat content can be increased through strategic dietary management without negatively impacting cow health. About 60% of milk fat comes from fatty acids in the blood while 40% is synthesized within the mammary gland. The price paid for milk fat varies but averaged $5.26/kg in the past year in the American Midwest, representing a potential increase in annual income of $228,000-289,000 for a 1,000 cow dairy by raising fat content from 3.7% to 4.0%. Several feed ingredients and additives have been shown to boost milk fat production, with diet being the primary environmental factor impacting milk fat levels.
La alimentación proteica en los rumiantes depende de la cantidad y composición de aminoácidos que fluyen al intestino delgado. Esto incluye la proteína microbiana sintetizada en el rumen, la proteína alimentaria no degradada y la proteína endógena. La cuantificación precisa de la síntesis de proteína microbiana y la degradabilidad de la proteína alimentaria son fundamentales para mejorar la formulación de dietas. Sin embargo, existen desafíos en cuanto a la estimación precisa de est
Protein intake and nitrogen efficiency go hand and handFernando Diaz
The document discusses nitrogen efficiency in ruminant animals like dairy cows. It reports that rumen nitrogen conversion efficiency is typically around 25% but can vary widely between animals. Efficiency is lower in ruminants than monogastric animals like poultry or swine that have efficiencies of 30-40%. Several studies found that nitrogen efficiency decreases as dietary protein concentration increases, with maximum production supported by diets containing around 16.5% crude protein. Surveys of dairy farms found average dietary protein levels of 17.5-17.8%, exceeding recommendations. Strategies to improve nitrogen efficiency include optimizing rumen degradable and undegradable protein levels to meet requirements without excess.
Produciendo leche en los estados unidosFernando Diaz
El documento resume datos sobre la producción lechera en Estados Unidos, incluyendo el número de granjas y vacas lecheras, razas comunes, producción por vaca, edad al primer parto y tipos de operaciones. También discute el pago por componentes de la leche, con la grasa y proteína variando en precio, y los costos de alimentación, que representan alrededor del 50% del costo total de producción lechera. Herramientas como el programa Sesame pueden ayudar a evaluar los precios de los ingredientes de la dieta
Field peas as a protein source for dairy cowsFernando Diaz
Field peas can partially replace soybean meal and corn in dairy cow diets according to several studies. Research found that replacing around 45% of soybean meal and corn with 15% field peas did not affect intake, milk yield, or milk composition. However, replacing over 24% of the diet with field peas for high producing cows decreased intake, milk yield, and milk protein linearly, likely due to the relative methionine deficiency of peas compared to soybean meal. The conclusion is that field peas can replace soybean meal with supplementation of rumen-protected methionine for high producing cows.
Sustitución de harina de soja por guisantes en dietas de vacuno lecheroFernando Diaz
El resumen es el siguiente:
1. Los cultivos proteicos en la UE solo representan el 3% de la tierra cultivable y aportan solo el 30% de los alimentos proteicos para animales, mientras que casi el 70% de los concentrados proteicos se importan.
2. Los guisantes son una buena alternativa a la harina de soja debido a su alto contenido proteico. Sin embargo, su perfil de aminoácidos es más bajo en metionina.
3. Estudios muestran que los guisantes pueden sustituir parcialmente la harina de so
Calidad de la proteina en granos de destileriaFernando Diaz
Este documento discute la variabilidad en la calidad de la proteína de los granos de destilería (DDGS) y su impacto en la formulación de dietas para rumiantes. Ha habido un gran aumento en la producción de DDGS en los últimos 20 años, pero su composición nutritiva varía dependiendo del proceso de producción y la planta de etanol. Estudios recientes muestran que los DDGS actuales tienen una mayor digestibilidad de proteína en el intestino que los DDGS evaluados hace 10 años, lo que mejora su valor nutritivo. Sin embargo, aún
Effect of malic acid in dairy cow dietsFernando Diaz
Malic acid is naturally found in forages and can benefit dairy cows when supplemented. Studies show malic acid can improve rumen fermentation by increasing propionate production and decreasing methane. In vivo studies on the effects of malic acid supplementation on dairy cow performance have found both increased milk yield and no significant effects. The response seems to depend on factors like the basal diet, forage type, and malic acid dose. More research is still needed to determine the ideal malic acid supplementation level for dairy cows.
El documento resume las principales características de la industria lechera de Estados Unidos según datos del censo agrícola de 2012 y un informe de 2016. California, Wisconsin y Nueva York fueron los principales estados productores de leche, con la mayoría de las vacas alojadas en granjas con más de 500 animales. La raza Holstein representó el 86% del total de vacas lecheras.
Mycotoxins are concentrated in distillers grainsFernando Diaz
The document discusses the risks of mycotoxins in distillers dried grains with solubles (DDGS), a common ingredient in dairy cattle feed. Key points:
1) Mycotoxins from moldy corn can pass through ethanol production and become concentrated in DDGS, with levels sometimes exceeding FDA limits.
2) Studies found mycotoxin levels in DDGS varied between ethanol plants and over time, depending on the contaminated corn used.
3) Surveys of dairy farms found some DDGS samples with mycotoxin levels above FDA safety guidelines, risking health issues for cattle. Regular testing and controlling contaminated ingredients in feed is important.
Benefits of fiber degrading enzymes in dairy cow dietsFernando Diaz
The addition of enzymatic feed additives to dairy cow diets can increase feed intake, animal performance, and profitability. Fiber-degrading enzymes enhance dry matter and fiber digestibility, improving feed efficiency. When added to forages and concentrates, these enzymes can increase intake by 2.4-7 lbs/day and milk yield by 2.2-2.4 lbs/day on average. Specifically, a blend of cellulase and xylanase increased income over feed costs per cow from $0.32 to $0.88 daily. While responses vary depending on diet, stage of lactation, and enzyme type, fiber-degrading enzymes generally aid digestion and utilization of feedstuffs in r
Uso de enzimas fibrolíticas en dietas de vacas lecheras III: Efectos sobre la...Fernando Diaz
El documento discute los efectos del uso de enzimas fibrolíticas en la eficiencia alimentaria de vacas lecheras. Solo 2 de 17 estudios reportaron mejoras en la eficiencia alimentaria debido a un menor consumo de alimento sin cambios en la producción de leche. La composición de la dieta y la dosis de enzimas influyeron en estos resultados. Otros estudios no encontraron efectos o reportaron una reducción en la eficiencia al alimentar vacas con enzimas fibrolíticas. La fuente y combinación de enzimas, así como el
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Cross ventilated barns for dairy cows: New building design with cow comfort in mind
1. eXtension
Cross-Ventilated Barns for Dairy Cows: New Building Design
with Cow Comfort in Mind
articles.extension.org/pages/68439/cross-ventilated-barns-for-dairy-cows:-new-building-design-with-cow-comfort-in-mind
The most important factors that determine the selection of the type of housing for dairy cattle are cost, animal
comfort, worker’s efficiency, durability, and a favorable return on investment. Since the first low-profile cross-
ventilated (LPCV) barn started to operate in South Dakota in the fall of 2005, at least six more facilities have been
built in that state using this technology, and dozens of them have been built in the rest of the country. Although
LPCV barns (enclosed, year-round controlled environment) are a new concept in the dairy industry, housing
systems similar to LPCV barns have been used for a long time in the swine and poultry industries. In the United
States, the number of dairy farms with more than 500 cows has increased in the last decade by more than 21%,
from 2,795 dairies in 2001 to 3,400 in 2010. This new facility design would be suitable for these larger dairy
operations.
Please check this link first if you are interested in organic or specialty dairy production.
One peculiarity of this design is that it merges conventional barns (4 or 6 rows of freestalls) under the same roof,
eliminating the space required to separate each barn. For example, when two traditional barns of 4 rows are
merged, a new LPCV housing with 8 rows is developed (Figure 1). The interior of the building is similar to the
conventional barns. The main difference is the presence of baffles that hang approximately half-way from the
ceiling and are attached to the barn columns (Picture 1). The function of these baffles is to increase the air velocity
and redirect air toward the freestalls. To reduce the height in the center of the barn, the slope of the roof changes
from a 4:12 pitch in conventional barns to a 0.5:12 pitch in LPCV barns. The height of the side walls is identical in
both types of facilities (minimum 12 feet), but because there is less roof slope, the height at the center of the barn
is lower in the LPCV barn; thus, the name low-profile. On one of the side walls, there are exhaust fans (Pictures 2
and 3) and on the opposite side, there is the air intake (made of evaporative panels in some cases; Picture 4); thus,
the name cross-ventilated. The access doors to the alleys are situated on the front end, similar to conventional
barns (Picture 5).
Figure 1. Example of a 667-foot long LPCV barn, with front doors to access each alley and a central alley that
connects the pens with the parlor.
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2. Picture 1. Metal baffles placed in between two rows of
freestalls.
Picture 2. Interior view of the side wall made up of fans.
Picture 3. Exterior view of the side wall made up of fans.
Picture 4. Interior view of the side wall with the air intake
made of evaporative panels.
Picture 5. Front view of an 18-row LPCV barn.
Dimensions
The width required for a conventional barn of 4 rows (103
feet) can be observed on the top of Figure 2, with head-
to-head freestalls and a central feeding alley. By merging
two, three, or four barns of this type, an LPCV barn is
formed of 8, 12, or 16 rows with widths of 213, 317, and
420 feet, respectively (bottom of Figure 2). Figure 3
shows a conventional barn with 6 rows (120 feet). A
frontal section of LPCV barns can be observed on the
bottom of Figure 3 of 12 (250 feet), 18 (370 feet), and 24
(490 feet) rows, obtained by merging two, three, or four
conventional barns of 6 rows. The LPCV housing
requires approximately 3-foot wide alleys along the
lateral walls to allow for access to the fans and
evaporative panels and to perform maintenance. The
examples in Figures 2 and 3 have been designed with
identical alleys and freestall dimensions. The freestalls
have a length of 9 feet, the feed lanes are 19 feet wide,
and the pen feed and back alleys are 14 and 10 feet,
respectively. The design and dimensions described in
this article are just an example of an LPCV barn, but
there can be variations. For example, two rows of
freestalls can be separated and placed head-to-head to
form two independent rows tail-to-tail. Another variation would be to have a feed lane along the lateral walls and in
this case, it would not be necessary to have an access alley to the fans and evaporative panels (Pictures 2 and 6).
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3. Figure 2. Top: Front view of a conventional barn with 4 rows of freestalls. Bottom: Front view of an LPCV barn with
8, 12, or 24 rows.
Figure 3. Top: Front view of a conventional barn with 6 rows of freestalls. Bottom: Front view of an LPCV barn with
12, 18, or 24 rows.
Picture 6. Interior view of the side wall with 2 rows of nozzles (red arrows).
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4. The main disadvantage of 6-row barns compared to 4-row barns is an approximately 40% reduction in feeding
space (3 rows of freestalls per feedbunk). This can result in a reduction of optimum feed intakes and can negatively
impact milk production. In addition, the alley area available to each cow decreases in similar proportion, which
results in overcrowding. Due to the lower investment per cow housed, barns with 6 rows are highly used,
particularly in larger dairies. If the width of the 4-row barn is increased by 17%, the number of freestalls increases
almost by 40%, when there are 6 instead of 4 rows. In addition, increasing to 6-row barns results in a 37%
reduction in natural ventilation (Chastain, 2006), which might become a problem on hot summer days.
Variations in dimensions and housing capacity can be seen in Table 1. In barns with a length of 667 feet, the
number of rows of freestalls increases from 4 in conventional to 24 in LPCV barns. The width of the alleys and
length of the freestalls are identical to those in Figures 1, 2, and 3. Due to their extreme length, the building is
divided in the middle by a 33-foot wide central alley that connects the pens with the milking parlor and allows
access for cleaning and bedding equipment. There are then 317-foot long pens on each side of the central alley.
Each pen has four cross alleys connecting the feed alley with the back alley. In these cross alleys, there are 15 feet
long for locating the waterers. The side alleys that are situated along the lines of fans and evaporative panels are 3
feet wide. The width of the freestalls is 4.1 feet, ideal for cows' 1,400 to 1,500 pounds of body weight. The bunk
space per cow is 2.6 feet with pens that have 2 rows of freestalls and 1.6 feet for pens with 3 rows. The alley area
per cow goes from 63.4 square feet in pens with 2 rows to 38.8 square feet in pens with 3 rows. The number of
freestalls in each pen is 120 for pens with 2 rows and 196 for pens with 3 rows. The housing capacity increases by
480 freestalls in 4-row conventional barns and up to 3,136 in LPCV barns with 24 rows (3 rows per pen).
Table 1. Dimensions (feet) and housing capacity of different barn types with a total length of 660 feet.
One of the advantages of the LPCV system compared to the conventional system is less space requirement
(smaller footprint). To facilitate natural ventilation, conventional barns need to be separated from other buildings at
least 100 feet or 1.5 times the width of the barn (Brouk et al., 2001). The surface area needed to build a 16-row
LPCV barn such as in Table 1 is 280,140 square feet. However, the area required to build four conventional barns
of 4 rows each is 474,904 square feet. Although both examples have 1,920 freestalls, the area required increases
by 72% in the conventional system. The area needed per cow goes from 146 square feet in a 16-row LPCV barn to
247 in a 4-row conventional barn. This is one point to consider due to the increase in agricultural land prices during
the last few years. In addition, this smaller building footprint reduces the distance that cows need to travel from the
pens to the milking parlor. Cows that walk less have more time for other activities such as eating or resting. These
benefits increase as milking frequency is increased.
There are several options in the number of doors needed to allow equipment access to the cow alleys. One of them
is to place a door in each alley (Picture 5). The other option is to place doors exclusively in the feeding lanes
(Picture 7) and access pen alleys from the central alley that connects the pens with the milking parlor. The width of
this alley depends on the maneuvering space required for each type of machine. With this design, the number of
doors in a 24-row LPCV barn may be reduced from 20 to 4.
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5. Picture 7. Front view of a 24-row LPCV barn.
Ventilation
The ventilation system consists of exhaust fans, baffles,
and air inlets. In contrast with conventional systems in
which mechanical ventilation is used exclusively during
hot weather, in LPCV systems, ventilation needs to work
24/7 year round. Therefore, backup generators and alarm
systems are required additions.
The fans refresh the air inside the barns with outside air to
reduce the indoor concentration of gases and heat. One of
the advantages of LPCV barns is the possibility to maintain constant air velocity year round. The performance of
the fans depends on their diameter, number of blades, operational speed, and potency of the motor. The suggested
fan dimensions are between 4 and 6 feet in diameter. They are placed on the opposite wall of the barn to the
evaporative panels that form the air inlets along the side wall. One advantage of the LPCV is that the flow of air is
across the barn, parallel to the freestalls, and can thus flow in between cows that are lying down. It is not
necessary or desirable for all fans to be working during the colder months, but it is still important to run some fans
to reduce the concentration of gases inside. Some farms control their ventilation system according to the
concentration of ammonia in the barn. At lower ambient temperatures, the opening of the air inlet can be reduced to
avoid freezing of the manure.
The baffles are placed longitudinally on the interior columns (Pictures 1 and 7). Their function is to increase the air
speed in the freestall area from 3 to 4.4 feet/second up to 8.8 to 11.7 feet/second (Harner and Smith, 2008). In
addition, they redirect the air toward the area of the freestalls. The bottom of the baffles is located at least 6 feet
from the floor, and it continues uninterrupted toward the ceiling. Therefore, the baffles do not interfere with the
movement of the animals. Baffles can be constructed with rigid (generally metal) or flexible (similar to tarp)
materials.
The air inlets can consist of evaporative panels. These panels are made of cellulosic fiber with channels that allow
the air to be humidified as it passes through the openings. Water circulates over the pad as air is drawn through it,
and all excess water is re-circulated in the system. The air temperature decreases as moisture increases, which
results in the lowest air temperature when air is 100% saturated with water. This is not the usual situation, as
maximum saturation efficiency is 85% in most evaporation panels. On the other hand, high relative humidity is not
recommended for adequate animal comfort. The saturation efficiency of the panels depends on the air speed that
goes through them. At lower speeds, the air has more time to incorporate moisture, and thus the efficiency
increases. To obtain saturation efficiencies of 70% and 80%, air speeds of 6.7 and 3.3 feet/second are needed,
respectively. Due to the quality/price relationship, 6-inch thick panels are utilized more frequently in cattle housing.
Water is added to the evaporative panels only during the warmer months when animal cooling is desired.
Some dairies have opted to substitute the evaporative panels with high-pressure water spray systems. These are
placed on the side wall where the air intake is located and send water droplets through aspersion. Several rows of
nozzles are needed to ensure homogeneous air saturation (Picture 6). The advantage of this system is that it
allows more natural light to enter the barn. For optimum performance, both cooling systems need periodic
maintenance and soft water with low mineral content.
Other Considerations
An important consideration with LPCV barns is to have an adequate artificial lighting system due to the fact that the
building is completely enclosed. The recommendation for lactating dairy cows is 16 to 18 hours of continuous light
each day, followed by 6 to 8 hours of darkness (Dahl, 2001). To observe a production response in lactating cows,
an intensity of 15 foot-candles at 3 feet from the floor of the stall is recommended (Dahl, 2001). However, dry cows
exposed to 8 hours of light and 16 hours of dark produced 7 lb/day more milk in the next lactation (Miller et al.,
2000). It is necessary for the walls and ceiling to be well insulated to minimize the problems with condensation in
the winter and heat transmission by radiation in the summer. Insulation materials such as polyurethane spray,
flexible fiberglass sheets, rigid panels, etc. are commonly used. To avoid moisture accumulation between the
insulation and the roof, it is very important to seal the junctions. An additional consideration is that these insulation
materials are highly combustible.
Lobeck et al. (2012) measured aerial ammonia and hydrogen sulfide concentrations in LPCV barns, naturally
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6. ventilated (NV) barns, and compost-bedded pack barns (CB). Ammonia concentrations (ppm, LS Mean ± SE) were
3.9 ± 0.35 for CB, 5.2 ± 0.35 for CV, and 3.3 ± 0.35 for NV barns. The CV barns had greater concentrations than
CB and NV barns (P = 0.049 and P = 0.005, respectively), whereas CB and NV barns were similar. Summer had
the highest concentration of ammonia in all three housing systems (P < 0.001). A separate analysis was performed
to determine if there were differences in ammonia concentrations from the inlet to the exhaust side in LPCV barns.
Ammonia concentrations were lower in the inlet side than the exhaust side of the barn (4.0 ± 0.27 vs. 6.2 ± 0.27,
respectively; P < 0.001). Even though an increase in ammonia concentration was observed, this should be of no
biological consequence as, according to the National Institute for Occupation Safety and Health (NIOSH), ammonia
exposure should not exceed 25 ppm. Hydrogen sulfide concentrations (ppb, LS Mean, 95% CI) were 13, 9-19 for
CB; 32, 22-45 for CV; and 17, 12-24 for NV barns. LPCV barns had higher concentrations than CB and NV barns
(P < 0.006 and P = 0.044, respectively), whereas CB and NV barns were similar. Hydrogen sulfide concentrations
(ppb, LS Mean, 95% CI) on the inlet side within LPCV barns were lower than the exhaust side of the barn (19, 11-
34 vs. 41, 24-71; P < 0.001). As the air moved through the barn, it was picking up the hydrogen sulfide that was
being released from the degradation of the manure. The recommended exposure limit for hydrogen sulfide by the
NIOSH is 10 ppm.
In addition, there might be considerations about animal well-being that favor LPCV barns. Different housing types
were evaluated (six LPCV barns, six compost-bedded pack barns, and six conventional naturally ventilated
freestalls) in a study conducted on 18 commercial dairy farms in Minnesota and eastern South Dakota (Lobeck et
al., 2011). There was a tendency for greater cow comfort (comfort index = cows lying down in a stall divided by all
animals touching a stall; 85.9% vs. 81.4%) and stall usage (stall usage index = cows lying down divided by all
animals in the pen not eating; 76.8% vs. 71.5%) in LPCV barns compared to conventional barns, respectively.
Dairy cattle housed in compost-bedded pack barns had reduced lameness and hock lesions compared with those
housed in freestalls. However, there were no differences in body condition, respiration rates, mastitis prevalence,
culling, or mortality between housing types.
Main Advantages and Disadvantages of LPCV Systems
Advantages:
maintain a controlled environment year round;
produce a constant air velocity and air flow between cows that are lying down in the freestalls;
reduce the distance between pens and the milking parlor, enabling cows to spend more time eating and
resting plus reduced hoof wear;
allow for greater control of flies and birds;
might improve animal welfare
Disadvantages:
greater energy use and fan maintenance costs due to forced ventilation year round;
only useful for large facilities; minimum suggested is 400 cows;
it can cause ventilation problems in the winter with temperatures below freezing because it needs a
minimum number of fans working, and these reduce the temperature causing manure to freeze;
In climates with high relative humidity, the cooling system by evaporation is less efficient to prevent heat
stress than in dry climates.
Author Information
Fernando Díaz-Royón1, Marcia I. Endres2, and Álvaro D. García1
1Dairy Science Department, South Dakota State University
2 Department of Animal Science, University of Minnesota
Cited Literature
Brouk, M.J., J.F. Smith and J.P. Harner. 2001. Heat stress abatement in four-row freestall barns. In: Proc. of the
Western Dairy Management Conference. Pp. 161-166.
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7. Chastain, J.P. 2000. Designing and managing natural ventilation systems. In: Proc. of the 2000 Dairy Housing and
Equipment Systems: Managing and planning for profitability. NRAES publication 129. Pp. 147-163.
Dahl, G.E. 2001. Photoperiod control improves production and profit of dairy cows. In: Proc. of the Western Dairy
Management Conference. Pp. 27-30.
Harner, J.P. and J.F. Smith. 2008. Low-profile cross-ventilated freestall facilities – A 2-year summary. In:
Proceedings of the High Plains Dairy Conference. Pp. 65-77.
Lobeck, K.M., M.I. Endres, K.A. Janni, S.M. Godden, and J. Fetrow. 2012. Environmental characteristics and
bacterial counts in bedding and milk bulk tank of low-profile cross-ventilated, naturally ventilated, and compost-
bedded pack dairy barns. Appl. Eng. Agric. 28(1):117‐128.
Lobeck, K.M., M. I. Endres, E.M. Shane, S. M. Godden, and J. Fetrow. 2011. Animal welfare in cross-ventilated,
compost-bedded pack, and naturally ventilated dairy barns in the upper Midwest. J. Dairy Sci. 94:5469-5479.
Miller, A.R., R.A. Erdman, L.W. Douglass, and G.E. Dahl. 2000. Effects on photoperiodic manipulation during the
dry period of dairy cows. J. Dairy Sci. 83:962-967.
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