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Balancing Feed Rations

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Maintain animal health Optimum animal production Reasonable production cost for the farm manager

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Why maintain animal health in horses? So that the horse can have a balanced diet that can maintain the horse’s weight and energy supply.

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Helps give protein and nutrient requirements needed for different stages of production. Maintenance Lactation Gestation Growth Yearling Long-yearling 2 year old Mature (4+ years)

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How does balancing a feed ration affect production cost? (better or worse?) Better It keeps from wasting feed

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Diagonal A square with lines connecting the opposite corners Percent 1% of a number means 1 hundredth of a number or.01 6% means six hundredths or.06 Pound Weight of an object Lb, # Systems of Equations Two or more equation in two or more variables to be solved simultaneously Ratio The comparison of two numbers by division

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2,000 pounds of feed is needed to feed a pregnant mare. A feeding standard table shows that a 10% crude protein ration is needed. Corn and soybean meal are selected as feeds. A feed composition table shows that corn has 9% and soybean meal has 45% crude protein on as-fed basis. How much corn and soybean meal need to be mixed together for 2,000 pounds of feed?

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What’s important? 2,000 pounds of feed needed 10% crude protein needed Corn contains 9% protein Soybean meal contains 45% protein

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Step 1 Draw a square with lines connecting the opposite corners. Write the percent of crude protein needed (10) in the center of the square where the lines cross.

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Step 2 Write the feeds to be used and their crude protein percents at the left hand corners of the square.

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Step 3 Subtract the smaller number from the larger number along the diagonal lines. Write the difference at the opposite end of the diagonals.

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Step 3—check The sum of the numbers on the right equals the difference in the numbers on the left.

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Step 4 Divide the parts of each feed by the total parts to find the percent of each feed in the ration. Corn: (35/36) x 100 = 97% Soybean: (1/36) x 100 = 3%

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Step 5 It is known that 2,000 pounds of the mixture is needed. Thus, the amount of corn needed is 1,940 pound. This is found by multiplying the percent of corn in the mix by the total pounds of the mix. 2,000 x 0.97 = 1,940 pounds

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Step 5 The amount of soybean meal needed 60 pounds. This is found by multiplying the percent of soybean meal in the mix by the total pounds of the mis 2,000 x 0.03 = 60 pounds

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Step 6 Check the mix to make sure the protein needed is met. Multiply the pounds of corn by the percent of protein in the corn (1,940 x 0.09 = 174.6). Multiply the pounds of soybean meal by the percent of protein in the soybean meal (60 x 0.45 = 27). Add the pounds of the protein together. Divide by the total weight of the mix.

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Step 6 174.6 + 27 = 201.6 (201.6 / 2000) x 100 = 10%

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%PoundProtein Corn9X.09 Soybean45Y.45 Total102,000.10(2,000)

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X + Y = 2,000.09X +.45 Y =.10(2000) Solve for a variable, in this case X: X + Y = 2,ooo -Y -Y X = 2,000 - Y

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Solve for Y.09(2000 – Y) +.45Y = 200 Substitute X with X=(2,000 – Y) 180 -.09Y +.45Y = 200

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180 +.36Y = 200 -180 -180.36Y = 20 (Divide both sides by.36) Y= 55.6 pounds of soybean

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Solve for X Substitute the value of Y into the first equation X + 55.6 = 2,000 -55.6 -55.6 X = 1944.4 pounds of corn

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Check X = 1944.4 pounds of corn Y = 55.6 pounds of soybean Substitute to check X + Y = 2,000 1944.4 + 55.6 = 2,000

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2,000 pounds of feed is needed to feed a lactating mare. A feeding standard table shows that a 12.5% crude protein ration is needed. Oats and linseed meal are selected as feeds. A feed composition table shows that oats has 12% and Linseed meal has 38% crude protein on as-fed basis. How much oats and linseed meal need to be mixed together for 2,000 pounds of feed?

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2,000 pounds of feed is needed to feed a weanling. A feeding standard table shows that a 14.5% crude protein ration is needed. Mixed sweet feed and a commercial protein supplement are selected as feeds. How much mixed sweet feed and commercial protein supplement need to be mixed together for 2,000 pounds of feed?

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2,000 pounds of feed is needed to feed a yearling. How much sorghum and soybean meal need to be mixed together for 2,000 pounds of feed?

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Animal Science II Principles of Animal Nutrition.

Animal Science II Principles of Animal Nutrition.

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