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Balancing Rations. Pearson Square. 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. Pearson Square.

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balancing rations

Balancing Rations

Pearson Square

pearson square
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
pearson square3
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.
pearson square4
Pearson Square
  • A feed composition table shows

Corn has 8.9% crude protein

SBM has 44.4 % crude protein

pearson square5
Pearson Square
  • How much corn and soybean meal need to be mixed together for 2000# of feed
pearson square7
Step 2 – Write the percentage of crude protein needed by the animal in t he center of the square where the diagonal lines crossPearson Square

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pearson square8
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

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pearson square9
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

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pearson square10
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
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Pearson Square
  • Corn 26.4 parts corn
  • 8.9% 35.5 total parts
  • SBM 9.1 parts SBM
  • 44.4% 35.5 total parts

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pearson square12
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
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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%

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pearson square14
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
pearson square15
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