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Animal Digestion
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What are Nutrients? Parts of food which provide for growth, maintenance, body functions Carbohydrates (CHO) Fats Proteins Vitamins Minerals Water
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What is a Ruminant? Animals with more than one stomach
Chew their cud (re-chew food) Cows, sheep, goats Cows have four stomach
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Why don’t cattle need as much B vitamins?
Microorganisms in the stomach of the cow make their own B vitamins Can also make some proteins if given the right kind of Nitrogen
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NonRuminants Foragers: Horse, rabbit NonForagers: pig, poultry
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How much to feed? Depends on function of animal
Pregnant, Lactating, Working, Growing How often to feed Depends on stomach size & rate of metabolism Stomach size is relavant to amount of feed fed Mink = 4-6 times/day, Cows = 1-2 /day
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What foods give energy? Carbohydrates (starch & cellulose) & Fats
Fat = 2 1/2 times energy of CHO Energy is major part of a feed ration Up to 90% of a ration for a steer Measured in Kilocalories or TDN (Total Digestible Nutrients)
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What are Proteins? Used to build muscle, body tissue
Made of amino acids Ruminants can make some proteins Simple Stomachs need specific amino acids
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What are Minerals? Natural elements which regulate certain body functions Na, Ca, P, Fe, Cu, K, Mn, Mg, Zn, Mo, Se, I, Co Most are trace minerals
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What are vitamins? Compounds responsible for certain functions
Fat Soluable = A, D, E, K Water Soluable = B, C
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What are additives? Antibiotics: disease prevention
Coccidiostats: control parasites Xanthophyll: makes egg yolks yellow Hormones: increase growth Tranquilizers: calm nerves (cattle, turkeys) Antioxidants: prevent feed from getting rancid Pellet Binders: keep in pellet form Flavoring Agents: make taste better
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Livestock Feeding Roughage = high fiber, low energy
Concentrate = low fiber, high energy
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How is a ration balanced?
Pearson square: balance a ration using any two ingredients for one nutrient How much Soybean Meal (44% Protein) should be mixed with Barley (13% Protein) to get a mixture that is 16% protein?
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Pearson Square
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Pearson Square Soybean Meal = 3 parts Barley = 28 parts
Total Parts = 31 Soybean Meal = 3/31 or 10% Barley = 28/31 or 90% If mixing a ton (2000#) SBM = 200#, Barley = 1800#
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