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PEARSON SQUARE Balancing a Ration

PEARSON SQUARE Balancing a Ration. Veterinary Assisting 3 SVEC. Pearson Square. A CRITICAL THINKING EXERCISE. Pearson Square. Useful tool for simplifying and balancing of rations

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PEARSON SQUARE Balancing a Ration

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  1. PEARSON SQUARE Balancing a Ration Veterinary Assisting 3 SVEC

  2. Pearson Square • A CRITICAL THINKING EXERCISE

  3. Pearson Square • 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

  4. Pearson Square 2000# of feed is needed to feed a 100# growing hog. • A feeding standards table shows that a 18% crude protein ration is needed. • Corn and Soybean Meal (SBM) are selected as feeds.

  5. Pearson Square • A feed composition table shows Corn has 8.9% crude protein SBM has 44.4 % crude protein

  6. Pearson Square • How much corn and soybean meal need to be mixed together for 2000# of feed

  7. Step 1 -Draw a 1 to 2 inch square. Place diagonal lines across the square. Pearson Square

  8. Step 2 – Write the percentage of crude protein needed by the animal in t he center of the square where the diagonal lines cross Pearson Square 18.0

  9. 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% Pearson Square 18.0

  10. 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 26.4 parts 8.9 % corn SBM 9.1 parts 44.4% SBM Pearson Square 18.0

  11. Pearson Square • 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

  12. Pearson Square • Corn 26.4 parts corn • 8.9% 35.5 total parts • SBM 9.1 parts SBM • 44.4% 35.5 total parts 18.0

  13. Pearson Square • 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

  14. Pearson Square • Corn 26.4 parts corn • 8.9% 35.5 total parts 74.4% • SBM 9.1 parts SBM • 44.4% 35.5 total parts 25.6% 18.0

  15. Pearson Square • 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

  16. Pearson Square • Our batch of feed = 2000 # ( 1 ton) • 2000# x .744 = 1488 # Corn • 2000# x .256 = 512 # SBM 2000# 0f feed @ 18.% Crude Protein

  17. This critical thinking exercise was created by: • L. William Shrum, Teacher • Veterinary Assisting Program • Seminole Vocational Education Center • Pinellas County, Florida

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