The document discusses calculations related to animal science including swine, cattle, and poultry production and management as well as feed formulations. It provides examples of calculations for expected farrowing, weaning, and marketing dates for swine. For cattle, it shows calculations for conception rate, calf crop, and weaning weight. For poultry, it demonstrates calculations for average hen numbers, egg production, and mortality. Finally, it presents the Pearson square method for formulating a 15% crude protein feed using available ingredients of different protein levels.

1. Animal
Science -
Computations
BY: LIC. AGRI. ANGELO
ESPINOSA, MPA, JD (CAND.)

2. CALCULATIONS…
Q1 Q2 Q3 Q4
SWINE PRODUCTION AND
MANAGEMENT
CATTLE PRODUCTION AND
MANAGEMENT
POULTRY PRODUCTION AND
MANAGEMENT
FEEDS AND FEEDING -
PEARSON SQUARE METHOD

3. ANSWER ME! (swine production)
1. A dry sow was inseminated today September 17, 2022, what is her expected date of farrowing?
2. If the said sow is to be treated against mange 14 DBF, when shall it be done?
3. If the suckling should creep feed 5DAF, when should it start?
4. if we adopt the farmer’s conventional weaning practice of 35 days, what is the expected date of
weaning the litter?
5. If the males in the litter will be castrated to 5DAF, what is the expected date of castration?
6. If the litter will be fattened for 4 months from date of farrowing, when will these hogs be
marketed?
Jan 9, 2023
Dec 26, 2022
Jan 14, 2023
Feb 13, 2023
Jan 14, 2023
May 9, 2023

4. ANSWER ME! (cattle production)
Given:
Cow inseminated last May 11, 2021 with 50 heads
Pregnancy test found out only 42 heads are pregnant
Aborted calf= 5 heads
kg/head of calf= 135 kg
Compute for the following:
1. Delivery date = February 18, 2022
2. Conception rate= 42/50 x 100= 84%
3. Calf Crop= 37/50 x 100= 74%
4. Kg per weaned calf= 74% x 135= 100kg

5. ANSWER ME! (poultry production)
Given:
September 1= 7, 200 hens
September 30= 5, 500 hens
Total egg produced= 120, 000
1. What is the average number of hens for the month? 7, 200 + 5,500 / 2= 6, 350
2. What is the average production of eggs/hen/month? 120, 000/ 6, 350 = 18.8 or 19eggs

6. ANSWER ME! (poultry production)
Given:
May 2021= 4,500 hens
If on 2nd, 8th, 16th and 22th of May culled 50, 100, 150, 200
Total egg produced= 110, 000
1. What is the number hen day? 4,500 x 31= 139, 500 hen day.
2. Determine Loss days during the month due to culling or mortality of birds= (31-2)x 50 + (31-8)x 100 + (31-16)x 150 + (31-22)x 200 = 7, 800 days
3. What is the Actual number of hen days? 139, 500 – 7,800 = 131, 700.
4. What is the no. of hens at the end of the month? = 4,500 – (50+100+150+200) = 4, 000.
5. What is the average number of birds per month? = 4,500 + 4, 000 / 2= 4, 250.
6. What is the average number of egg production/bird on monthly basis? = 110, 000/ 4, 250 = 25.88 or 26 eggs
7. What is the average number of birds per month (on hen-day basis)?= 131, 700 / 31 = 4, 248.
8. What is the average egg production per bird?= 110, 000 / 4, 248 = 25.89 or 26 egg
9. What is the percent of egg production in month?= 110, 000 / 131, 700 x 100= 83%

7. ANSWER ME! (feeds and feeding)
Given:
Calculate the portion of a grain needed to make a 15% CP mix. The grain we have available is lupins at
30% protein and barley at 12% protein.

8. ANSWER ME! (feeds and feeding)
Solution:
Step 1. Draw a square and insert the desired crude protein (15%) in the middle of the square.
Step 2. Place the two grains and their respective crude protein contents on the left hand corners of the square.
Step 3. Calculate the difference between the middle value and the value on the bottom and top left hand corners of the square and
place the result diagonally opposite. These values represent the portion of each grain required to produce a grain mix with a CP
level of 15%. 30-15=15 (Value in the bottom right corner of the square) 12-15=3 (Value in the top right corner of the square) Note
– disregard the negative or positive value of the numbers.
Step 4. Calculate the percentage of each grain. Add the two portion figures to give the total and calculate each feed as a
percentage. 3+15=18 Lupins (Difference of middle value and barley value) 3 ÷ 18 (total of the two differences) 0.167 x 100 = (% of
lupins) 16.7 % Barley (Difference of middle value and lupin value) 15 ÷ 18 (total of the two differences) 0.833 x100 = (% of barley)
83.3

9. ANSWER ME! (feeds and feeding)
Given:
1000lb of feed is needed to feed a cow.
A feeding standards table shows that a 15% crude protein ration is needed.
Corn and Soybean Meal (SBM) are selected as feeds.
A feed composition table shows :
10:45
What is the ratio of each feed to include?
How much corn and soybean meal need to be mixed together for 2000kg of feed?

10. ANSWER ME! (feeds and feeding)
Solution:
1. Subtract the nutrient requirement (middle of square) from the nutrient concentration (on left of square) in the feed across the diagonal (top left – middle = bottom right;
bottom left – middle = top right). Repeat this for both feeds. Make any negative numbers on the right side of the square positive. The answers on the right side of the
square are the parts of each feed to include in the ration.
Subtract across the diagonal:
a. 15% - 10% = 5 parts soybean meal
b. 15% - 45% = 30 parts corn
2. After subtracting across the diagonal, sum the parts of the two feeds to get the total.
Sum the parts: a. 5 parts soybean meal + 30 parts corn = 35 total parts
3. Then, divide each part by the sum of the parts to calculate the percent of each feed in the ration.
Divide each part by the total to calculate the percent of each feed to include:
a. 5 parts soybean meal ÷ 35 total parts = 0.143 * 100 = 14.3% soybean meal
b. 30 parts corn ÷ 35 total parts = 0.857 * 100 = 85.7% corn
Ratio is 10:45 is to 85.7:14.3
So, in a half-ton (1,000-pound) batch of this corn and soybean meal mix, 143 pounds of soybean meal and 857 pounds of corn are needed to achieve 15% CP in the mix (calculations shown below).
Soybean meal: 1,000 lb * (14.3 ÷ 100) = 143 lb SBM Corn: 1,000 lb * (85.7 ÷ 100) = 857 lb corn