Pearson Square - Balancing a Ration

PEARSON SQUARE Balancing a Ration 10/24/2024 1  Develop a basic knowledge of a wellbalanced ration for each class of livestock  Select and determine values of feeds  Formulate several rations using the Pearson square or a computerized program Objectives 10/24/2024 2  Useful tool for simplifying and balancing of rations  It shows the proportions or percentages of two feeds to be mixed together to give a percentage of the needed nutrient Pearson Square 10/24/2024 3 2000# of feed is needed to feed a 100# growing hog.   A feeding standards table shows that an 18% crude protein ration is needed. Corn and Soybean Meal (SBM) are selected as feeds. Pearson Square 10/24/2024 4  A feed composition table shows Corn has 8.9% crude protein SBM has 44.4% crude protein Pearson Square 10/24/2024 5  How much corn and soybean meal need to be mixed together for 2000# of feed? Pearson Square 10/24/2024 6 Step 1 -Draw a 1- to 2-inch square. Place diagonal lines across the square. Pearson Square 10/24/2024 7  Step 2 – Write the percentage of crude protein needed by the animal in the center of the square where the diagonal lines cross 18.0 Pearson Square 10/24/2024 8  Step 3 –Write the feeds to be used at each corner. Place the percent of crude protein in the feeds after the name of the feed Corn  8.9%  SBM  44.4%  18.0 Pearson Square 10/24/2024 9  Step 4 – Subtract the smaller of the numbers from the larger numbers. (This involves crude protein needed by the animal and that provided by the feed.) Write the difference in the opposite corners Corn parts 8.9 % corn 26.4  SBM parts  44.4% SBM  18.0 9.1 Pearson Square 10/24/2024 10     Step 5 – The numbers at the two right corners are parts of the two feed ingredients that are needed. 26.4 parts corn +9.1 parts soybean meal (SBM) 35.5 total parts Pearson Square 10/24/2024 11 Corn  8.9%  Pearson Square SBM  44.4% 9.1 parts SBM 35.5 total parts   26.4 parts corn 35.5 total parts 18.0 10/24/2024 12  Step 6 – The percentage of each feed needed in the ration can be found by dividing the number of parts by the total parts, then multiply by 100.  26.4/ 35.5 = .744 x 100 = 74.4% corn 9.1/ 35.5 = .256 x 100 = 25.6% sbm  Pearson Square 10/24/2024 13 Corn  8.9% 26.4 parts corn 35.5 total parts 74.4%  SBM  44.4%  18.0 25.6% 9.1 parts SBM 35.5 total parts Pearson Square 10/24/2024 14  Step 7 – The amount of each feed ingredient for a large batch of feed is determined by multiplying the percentage of each by the total amount of feed desired Pearson Square 10/24/2024 15  Our batch of feed = 2000 # ( 1 ton)  2000# x .744 = 1488 # Corn 2000# x .256 = 512 # SBM  2000# of feed @ 18% Crude Protein Pearson Square 10/24/2024 16  Develop a basic knowledge of a wellbalanced ration for each class of livestock  Select and determine values of feeds  Formulate several rations using the Pearson square or a computerized program Review Objectives 10/24/2024 17