Animal co-product hydrolysates: a source of key molecules in aquaculture feeds


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Changes in production technology and marketing and changes in feed ingredients are key structural transformations necessary for the aquaculture sector to grow. Today, with improved genetic techniques novel genetic lines are being bred for maximum efficiency over a shorter production period with lower feed conversions. Thus, the correct amount of micro-nutrients present in their diet is crucial.

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Animal co-product hydrolysates: a source of key molecules in aquaculture feeds

  1. 1. I N C O R P O R AT I N G f i s h far m ing t e c h no l og y November | December 2013 Animal co-product hydrolysates: a source of key molecules in aquaculture feeds International Aquafeed is published six times a year by Perendale Publishers Ltd of the United Kingdom. All data is published in good faith, based on information received, and while every care is taken to prevent inaccuracies, the publishers accept no liability for any errors or omissions or for the consequences of action taken on the basis of information published. ©Copyright 2013 Perendale Publishers Ltd. All rights reserved. No part of this publication may be reproduced in any form or by any means without prior permission of the copyright owner. Printed by Perendale Publishers Ltd. ISSN: 1464-0058 The International magazine for the aquaculture feed industry
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  3. 3. FEATURE Animal co-product hydrolysates: a source of key molecules in aquaculture feeds by Sergio F Nates, ALAPRE, Costa Rica, Victor Suresh, United Research Pte. Ltd, Singapore, and Kent Swisher, National Renderers Association, USA C hanges in production technology and marketing and changes in feed ingredients are key structural transformations necessary for the aquaculture sector to grow. Today, with improved genetic techniques, novel genetic lines are being bred for maximum efficiency over a shorter production period with lower feed conversions. Thus, the correct amount of micro-nutrients present in aqua diets is crucial. On the other hand, the rapid growth of aquaculture worldwide has become increasingly dependent upon the use of external feed inputs, and in particular upon the use of compound aquafeeds. Pressures to reduce fishmeal consumption for sustainability reasons, combined with economic reasons, require intensive research efforts to find candidates for fishmeal replacement. However, formulating low fishmeal aquaculture feeds requires the use of combinations of several ingredients since most feedstuffs have been shown to have significant nutrient and functional limitations and cannot be used table 1: effect of hydrolysis on animal byproducts effect of hydrolysis resulting benefit 1. Digestion of protein Improved digestibility, absorption and assimilation of peptides 2. Increase in the proportion of low molecular compounds like short-chain peptides, free amino acids and nucleotides enhanced attractability and palatability 3. Production of bioactive peptides antioxidant and anti-microbial activities individually at very high levels in the diets of most aquaculture species. Fishmeal has always been the main source and the preferred choice of nutritionists for quality protein, above all in the formulation and especially in feeds for the youngest ages. Though, with the market volatility of fishmeal, the aquaculture feed industry is looking for cheaper sources of protein to substitute the fishmeal and this has become a priority. Additional renewable and sustainable protein alternatives are needed. Animal byproducts are well accepted as aquafeed ingredients these days due to short supplies and the escalating cost of fishmeal. Protein content in animal byproducts is higher and their complement of indispensable amino acids is superior to those of plant origin. In addition, Animal Co-Product Hydrolysates (ACPH) can meet the many nutritional needs of aquaculture worldwide as a protein alternative in aquafeeds. ACPHs can help reduce pressure on natural fisheries stocks and provide sustainability to the growing demand for aquatic products. Methods ACPHs result from controlled enzymatic digestion of byproducts from the meat processing industry. Technically, it is feasible to generate ACPH from most kinds of 10 | INterNatIoNal AquAFeed | November-December 2013
  4. 4. FEATURE Hydrolysis improves the nutritive value of feed ingredients that are produced from slaughterhouse waste (Table 1). Enzymatic digestion of the raw material breaks the protein chains into peptides that are better absorbed in the gut. Enzymatic hydrolysis of poultry meal with endo- and exopeptidases shows the feasibility of hydrolysing poultry byproducts so significant amounts of shortchain peptides and free amino acids can be produced. High levels of digestible protein characterise poultry protein hydrolysates with a digestibility index above 95 percent. Feather hydrolysates produced by bacterial keratinases have been tested as additives in aquaculture feeds and several species of bacteria with high keratinolytic activity has been isolated from feather meal broth. In recent studies, it has been established that pepsin digestibility and amino acid content of fermented feather meal (FFM) can be far better than those of commercial feather meal. The microbial cells could also potentially supply carotenoid pigments to FFM, whereby the ingredient may be useful in animal feeding not just as a source of protein but also that of pigments. The short-chain peptides and free amino acids produced as a result of hydrolysis along with nucleotides that are rich in meats confer excellent attractability and palatability properties to ACPH. Poultry liver hydrolysates have been added to animal feeds at levels as high as 6 percent and have been found to enhance palatability. Spray-dried hydrolysates produced from poultry byproduct meal can contain up to 70 percent protein with compounds that have molecular weights ranging from 5,800 to 12,000 Da. We have found that inosine is the dominant nucleoside in poultry meal, a molecule that is believed to enhance diet attractability in several fish species, including largemouth bass, turbot and mackerel. Among monophosphate forms, adenosine monophosphate (AMP) dominated and similar trends have been seen in fishmeal hydrolysates. It is known that alkali-hydrolysates and enzyme-hydrolysates from meat and bone meal, blood meal and feather meal have similar ash and protein content as the parent materials, but with concomitant liberation of bioactive peptides that are encoded within the protein. It has been demonstrated that ACPH prepared under alkaline hydrolysis can be a source of antioxidants with activities comparable to BHT. Results from previous studies have also shown the presence of antioxidant, carnosine, Mycofix x i n Ri sk M a to M YC OF I X en t Results and Discussion Myco slaughterhouse waste such as scrape meat, offal, feathers, and blood as well as from rendered animal byproducts such as meat and bone meal, poultry meal, feather, and blood meal. Protein materials are partially defatted by hexane extraction prior to hydrolysis. Hydrolysis is conducted in a thermostat reaction vessel with constant stirring adequate to prevent the settling of the substrate in the vessel. Alkaline hydrolysates are produced with 0.1 g CaOH/g substrate, at 85 °C. During enzymatic hydrolysis, pH is monitored continuously and maintained through the addition of 8M NaOH. Alkaline hydrolysis reactions are terminated by sparging with CO 2 until the pH drops to 9, followed by neutralization with sulphuric acid. Enzymatic reactions can also be terminated by raising the reaction temperature to 90 °C for 10 minutes. Residual solid material is removed by centrifugation followed by filtration. To test the antioxidant activities of ACPHs, two hydrolysis methods have been adopted1, including the alkaline hydrolysis by a strong base and an enzymatic hydrolysis by a commercial enzyme protease at a specific pH condition. Most results have showed that alkaline hydrolysis produced better antioxidant hydrolysates than the enzymatic hydrolysis2, 3. nag eM ® More protective. Mycotoxins decrease performance and interfere with the health status of your animals. Mycofix is the solution for mycotoxin risk management. ® Naturally ahead November-December 2013 | INterNatIoNal AquAFeed | 11
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  6. 6. FEATURE to elicit feeding in satiated animals, and ‘Defensins’ that show antimicrobial activity against bacteria and fungi, but at this point we don't know if these molecules are present in animal by-products. Compared with fishmeal, dried porcine blood co-products and bone protein hydrolysates are poor in methionine and lysine6. However, blood by-products are rich in microelements, which can improve Ca and Cu retention in aquaculture species, especially shrimp in which it has been reported that inadequate supplementary dietary copper level can result in significant growth depression. Porcine plasma hydrolysates are also effective inhibitors of lipid oxidation as well as metal chelating and reducing agents. Conclusions While we need to keep in mind the ability of bioactive peptides and nutraceuticals to exert a physiological effect in vivo, these examples of key molecules found in animal by-product hydrolysates show the potential for use as functional ingredients in aquaculture feeds. References a histidine containing dipeptide, in poultry byproducts4, 5. Carnosine levels in poultry products ranged from 0.95-102.3 mg/g (wet basis) (Table 2). Carnosine levels in meat and bone meal ranged from 500 to 1,800 ppm, while in fishmeal they can be as low as 5 ppm. Soy and higher than that in the control group, and diets supplemented with carnosine could increase the levels of GH, IGF-1 and T3 in their serum indicating that diets supplemented with carnosine could improve antioxidation in muscle. Anti-microbial peptides have also been Table 2: Carnosine levels in different tissues of stress and non-stress broilers (from Manhiani, 2011) organ treatment Calcium content ppm Breast non-stress 6.74±0.07a stress p-value Carnosine p-value content (wb)2,3 p=0.001 stress Brain 13.99±0.19b non-stress 8.48±0.38a stress p=0.002 13.78±0.24 1.85±0.241,a p=0.005 7.52±0.97a P=0.0005 70.89±5.39b 11.10±1.02a p=0.001 44.47±4.08a 21.25±1.25b thigh non-stress 10.50±0.37a p=0.006 p-value 17.39±1.33b 11.03±0.13b Carnosine content (db) 85.12±5.01b 10.16±1.53a1 p=0.82 45.44±12.37a 10.27±2.77a 55.12±14.88 P=0.002 P=0.54 1. All values are in Mean± S.E.M (N=5) 2. wb= wet basis; db= dry basis 3. Carnosine content is expressed in mg/gm of the original sample 4. Fisher's least significant difference test was used to compare mean values; a-b similar letters indicate that teh means values are not significantly different (p≥0.05); while different letters indicate that the mean values are significantly different (p≤0.050 other plant proteins don't contain carnosine. The results of adding carnosine on growth performance of Nile tilapia showed that the body weight and body length of tilapia in the group supplemented with carnosine were 1. Kalambura S., Kricka T., Jurišic V. and Z. Janjecic (2008) Alkaline hydrolysis of animal waste as pretreatment in production of fermented fertilizers. Journal Cereal Research Communications 36(5):179-182. 2. Bo Li, F. Chen, X. Wang, B. Ji, and Yonnie W. (2007) Isolation and identification of antioxidative peptides from porcine collagen hydrolysate by consecutive chromatography and electrospray ionization–mass spectrometry. Food Chemistry. 102:1135-1143. 3. Jingbo L., Zhipeng Y., W Zhao, S. Lin, E. Wang, Y. Zhang, H. Hao, Z. Wang, and Feng C. (2010) Isolation and identification of angiotensionconverting enzyme inhibitory peptides from egg white protein hydrolysates. Food Chemistry, 122:1159-1163. 4. Manhiani P. S. (2011) Carnosine content and antioxidant activity from poultry co-products, proetin meal and stressed poultry tissues. P.h.D. Dissertation, Clemson University. 179 pp. 5. Manhiani P.S., Northcult J.K., Bridges W.C. and Dawson Pl.L. (2013) Antioxidant activity of carnosine extracted from various poultry tissues. Poultry Science 92(2): 444-453. 6. Sun, Q. and H. Shen (2011). Antioxidant activity of hydrolysates and peptide fractions derived from porcine hemoglobin. Journal of Food Science and Technology 48(1): 53-60. identified in PBM and FeM hydrolysates. These include cysteine-rich antimicrobial peptides. Other potential molecules that can be found in cattle, chickens and turkeys include ‘Galanin’, which has previously been reported 12 | INterNatIoNal AquAFeed | November-December 2013 More InforMatIon: Email:
  7. 7. FEATURE MOBILE You can now find International Aquafeed content on your mobile phone, including full feature articles (not to mention a whole host of other Perendale content - including The International Milling Directory). Simply visit on your mobile to launch the our app - it’s all free. EVENTS Our Events register contains all the information that you need about all of the up-coming industry events, and forms an essential part of our app for all industry professionals PP he e APP her r re re Get your f e e i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i NEWS i i i i i i i i i AQUACULTURE i i i i i i i i i GLOBAL November-December 2013 | INterNatIoNal AquAFeed | 13
  8. 8. LINKS This digital re-print is part of the November | December 2013 edition of International Aquafeed magazine. Content from the magazine is available to view free-of-charge, both as a full online magazine on our website, and as an archive of individual features on the docstoc website. Please click here to view our other publications on • See the full issue I N C O R P O R AT I N G f I s h fA R m I N G T e C h N O l O G y Animal co-product hydrolysates: • Visit the International Aquafeed website • Contact the International Aquafeed Team • Subscribe to International Aquafeed – a source of key molecules in aquaculture feeds Prevalence of mycotoxins in aquafeed ingredients: – an update Pellet distribution modelling: – a tool for improved feed delivery in sea cages New functional fish feeds to reduce cardiovascular disease Vo l u m e 1 6 I s s u e 6 2 0 1 3 - N oV e m B e R | D e C e m B e R To purchase a paper copy of the magazine, or to subscribe to the paper edition please contact our Circulation and Subscriptions Manager on the link above. INFORMATION FOR ADVERTISERS - CLICK HERE