Protein Sources

Protein Sources - Chapter 3 Protein Sources Protein Quality...

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Chapter 3 Protein Sources
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Protein Quality Kinds, amounts, and ratio of amino acids in a feedstuff All AA’s physiologically needed, but EAA’s must be provided Remember all essential AA’s Variability in composition of feeds In nonruminants, supplementation to ensure intake of all EAA’s Amino Acids Mixture of feeds NPN (non-protein nitrogen): may be fed to ruminants
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Proteins Provide amino acids for: Maintenance of vital functions. Growth Lactation Non-ruminant animals: need pre-formed amino acids. Ruminants: Utilize many other nitrogen sources Synthesize amino acids and protein from NPN Mechanism to spare N
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Biological Value Page 43, Chapter 1 BV = measure of the relationship of protein (or N) retention to protein (or N) absorption. BV= N(intake)- (UN+FN)/ Nm- fecal N % of true absorbed protein (or N) from the intestinal tract available for productive body functions. Formula in book p. 44
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Rumen Protein Metabolism: Protein to Small Intestine 3 sources Dietary protein escaping rumen degradation (RUP) Microbial protein Protein contained in bacterial and protozoal cells that flow out of rumen Endogenous proteins contained in sloughed cells and secretions to abomasum and SI Pancreatic and intestinal enzymes break down these forms of protein so amino acids and peptides can be absorbed in small intestine
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Protein Feeds Protein Supplements Arbitrarily defined as having greater than 20% crude protein on a dry matter basis. Generally are concentrate feeds. Some forages will have the required amount of CP but are not considered protein feeds.
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Protein Sources Oilseed meals Grain legumes Milling By-Products Distillery and Brewery By-Products Animal Protein Sources Synthetic Amino Acids Nitrogen Sources for Ruminants Miscellaneous sources
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Oilseed Meals Soybean meal Cottonseed meal Whole cottonseeds Rapeseed and canola meal Linseed meal Peanut meal Sunflower meal Safflower meal
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Grain Legumes Soybeans Dry beans Fava beans Field peas and lentils Others Cowpea chickpea
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By-Products Milling By-Products Corn gluten meal Distillery and Brewery By-Products
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Animal Protein Sources Meat meal Meat and bone meal Blood meal Fish meal Other fish and marine products Liquefied fish Fish silage Shrimp meal Crab meal Crustacean processing waste Hydrolyzed feathermeal Hydrolyzed hair; hydrolyzed leathermeal Milk products
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Synthetic Amino Acids Methionine Lysine Taurine
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Nitrogen Sources for Ruminants NPN = nonprotein nitrogen Urea Biuret Dried poultry waste Bypass protein
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Miscellaneous Protein Sources Single cell protein (SCP) – see page 238 Bacteria, yeast, algae, fungi Animal Wastes
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Oilseed Meals By-products of vegetable oil production for edible and industrial purposes
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Protein Sources - Chapter 3 Protein Sources Protein Quality...

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