Pearson square
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Pearson's Square is a method used to determine the proportions of feeds needed to produce a ration with a specific quantity and crude protein percentage. It involves drawing a square, labeling feeds and their protein percentages on sides, subtracting smaller from larger numbers along diagonals, dividing parts of each feed by the total parts to find its percentage in the ration. An example shows using it to mix soybean meal and corn to make 1200 lbs of 25% crude protein hog feed.
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Pearsonโs square
Pearson's Square is a method for determining the exact proportions of feedstuffs needed to produce a specific quantity of nutrient. It involves drawing a square and labeling feeds and their crude protein percentages on the left corners and feeds on the right corners to match. Numbers are then subtracted along the diagonal lines and parts of feeds are divided by the total parts to find the percentage of each feed in the ration. The total pounds needed are then used to determine the pounds of each feed, and the results are checked to ensure the protein needs are met.
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ABN 523 lecture.ppt
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Pearson square
- 2. Label feeds and crude protein percentages on the left corners and feeds on right corners.
- 3. Subtract the smaller number from the larger along the diagonal lines.
- 4. Divide the parts of feed by the total parts to find the percent of each feed in the ration.
- 5. Use total pounds needed to determine the pounds of each feed need.
- 6. Check to make sure the protein number at the end fits with the number of crude protein in the middle of the square.Example:<br />You need 1200 lbs of a 25% crude protein (CP) hog feed. You want to mix soybean meal (50% CP) and corn (10% CP) to make your feed ration.<br /> 50% CP Soybean meal15 parts soybean meal<br />25% Crude Protein<br /> 10% CP Corn25 parts Corn<br />40 whole<br />37.5 % Soybean Meal 15 parts/40 whole x 100%= 37.5%<br />62.5% Corn25 parts/40 whole x 100%= 62.5%<br />450 lbs. Soybean Meal 37.5% X 1200 lbs. = 450 lbs.<br />750 lbs. Corn 62.5% x 1200 lbs. = 750 lbs.<br />Double Check<br />225 lbs. CP in Soybean Meal 450 lbs. x 50% CP = 225 lbs. CP<br />75 lbs. CP in Corn750 lbs. x 10% CP = 75 lbs. CP<br />300 total lbs. CP in ration 225 lbs. + 75 lbs. = 300 lbs.<br />25% protein in finished mix300 lbs. / 1200 lbs. = 25%<br />