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FARM ANIMAL NUTRITION

FARM ANIMAL NUTRITION. ANIMAL SCIENCE 110 Fall 2001. NUTRIENTS. A nutrient is any feed constituent that functions in support of life. Structural components of cells and organs. Sources of energy for maintenance & production. Regulation of body processes.

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FARM ANIMAL NUTRITION

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  1. FARM ANIMAL NUTRITION ANIMAL SCIENCE 110 Fall 2001

  2. NUTRIENTS • A nutrient is any feed constituent that functions in support of life. • Structural components of cells and organs. • Sources of energy for maintenance & production. • Regulation of body processes. • Accessory functions such as growth, reproduction, lactation, etc.

  3. SIX CLASSES OF NUTRIENTS • WATER • CARBOHYDRATES • FATS • PROTEINS • MINERALS • VITAMINS

  4. WATER • Transport of other nutrients • Temperature regulation • Gives body shape or form • Involved in most biochemical reactions • Clean fresh water is essential for all animals • Embryo is 90% water, newborn is 70% water and market animal is 50% water • Several factors affect water intake

  5. CARBOHYDRATES • “CH2O” • Monosaccharides • Glucose, Fructose & Galactose • Disaccharides • Sucrose, Maltose & Lactose • Polysaccharides • Starch, Glycogen, Hemicellulose & Cellulose • Lignin (Indigestible & not a true carbohydrate)

  6. FATS • Energy – 2.25 times the energy of CH2O • Most are triglyceride (glycerol + 3 fatty acids) • Saturated – no double bonds – animal origin • Unsaturated & polyunsaturated – plant origin • Precursors of cholesterol, prostaglandin and structural components of cells • Some vitamins are fat soluble

  7. PROTEINS • Contain nitrogen – long chain amino acids • Average 16% N (100/16 = 6.25) • Plants synthesize amino acids from elements in the environment • Animals require a dietary source of amino acids • Rumen microorganisms can synthesize amino acids and protein

  8. PROTEINS • An essential amino acid is one that can not be synthesized at a rate which would provide normal growth • Nonessential amino acids can be synthesized from other amino acids • A limiting amino acid is one present in the lowest amount relative to the requirement • Lysine, methionine & tryptophane are likely to be limiting in diets for monogastric animals

  9. Phenylalanine Valine Threonine Methionine Arginine Tryptophane Histidine Isoleucine Leucine Lysine ESSENTIAL AMINO ACIDS

  10. Alanine Aspartic Acid Citrulline Cystine Glutamic Acid* * Required by chick for optimal growth Glycine* Hydroxyproline Proline* Serine Tyrosine NONESSENTIAL AMINO ACIDS

  11. MINERALS • Inorganic elements • Structure – skeleton & teeth • Acid – base balance in body fluid • Osmotic pressure in cells • Maintain acidity of digestive juices – most enzymes are pH specific • Muscle contraction & CNS • Interact with vitamins (Se-Vit E)

  12. MACRO Calcium Phosphorous Sodium Chlorine Sulphur Potassium Magnesium MICRO Iron & Copper Iodine & Fluorine Cobalt Manganese Molybdenum Selenium Zinc MINERALS

  13. VITAMINS • Organic compounds which function as metabolic regulators • Fat soluble vitamins • “A” maintenance of epithelial tissue • “D” calcium & phosphorous metabolism • “E” antioxidant – (selenium) • “K” blood clotting

  14. B1- Thiamine B2- Riboflavin B6- Pyridoxine Pantothenic Acid Folic Acid Niacin B12- Cyanocobalamin Choline Biotin C - Ascorbic Acid (not in livestock) WATER SOLUBLE VITAMINS

  15. CONCENTRATES vs ROUGHAGES • Concentrates include cereal grains, oil meals, molasses and dried milk products • They are high in energy, low in fiber and highly digestible (80% to 90%) • Roughages include hay, straw, silages, green chopped forage and pasture • They are 50% to 60% digestible except for straw which is lower

  16. PROXIMATE ANALYSIS of FEEDS • Moisture or dry matter – oven • Crude Protein – Kjeldahl procedure • Crude Fat – ether extract • Crude Fiber – acid/base digestion • Mineral – ash • Nitrogen Free Extract – determined by difference (primarily starch & sugar)

  17. VAN SOEST & Other Procedures for Fiber Analysis • Neutral Detergent Fiber (NDF) – plant cell walls [hemicellulose, cellulose & lignin] • Acid Detergent Fiber (ADF) – cellulose & lignin • NDF-ADF = hemicellulose • Acid Detergent Lignin (ADL) • Near-infrared Reflectance (NIR) – spectrometer to predict forage quality

  18. TOTAL DIGESTIBLE NUTRIENTS (TDN) • Chemical analysis does not indicate availability of nutrients to animal • Apparent Digestibility • [(Nutrient in Feed – Nutrient in Feces)/ Nutrient in Feed] x 100 • TDN = [Dig.Protein + Dig.Crude Fiber + Dig.NFE + (Dig.EE x 2.25)] x 100

  19. ENERGY DEFINITIONS • Calorie – Amount of heat energy required to raise 1 gm of water 1oC (14.5o to 15.5oC) • Kilocalorie – 1000 calories • Megacalorie – 1000 Kilocalories

  20. NET ENERGY SYSTEM • Gross Energy (GE) = Total heat of combustion • Digestible Energy (DE) = GE – Fecal Energy. DE is similar to TDN • Metabolizable Energy (ME) = DE – Urine & Gas Energy • Net Energy = ME – Heat Increment • Nem or NEg or NEl

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