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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. • Accessory functions such as growth, reproduction, lactation, etc. SIX CLASSES OF NUTRIENTS • • • • • • WATER CARBOHYDRATES FATS PROTEINS MINERALS VITAMINS 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 CARBOHYDRATES • “CH2O” • Monosaccharides – Glucose, Fructose & Galactose • Disaccharides – Sucrose, Maltose & Lactose • Polysaccharides – Starch, Glycogen, Hemicellulose & Cellulose – Lignin (Indigestible & not a true carbohydrate) 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 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 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 ESSENTIAL AMINO ACIDS • Phenylalanine • Valine • Threonine • Methionine • Arginine • Tryptophane • • • • Histidine Isoleucine Leucine Lysine NONESSENTIAL AMINO ACIDS • • • • • Alanine Aspartic Acid Citrulline Cystine Glutamic Acid* * Required by chick for optimal growth • • • • • Glycine* Hydroxyproline Proline* Serine Tyrosine 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) MINERALS • • • • • • • MACRO Calcium Phosphorous Sodium Chlorine Sulphur Potassium Magnesium • • • • • • • MICRO Iron & Copper Iodine & Fluorine Cobalt Manganese Molybdenum Selenium Zinc 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 WATER SOLUBLE VITAMINS • • • • • B1- Thiamine B2- Riboflavin B6- Pyridoxine Pantothenic Acid Folic Acid • • • • • Niacin B12- Cyanocobalamin Choline Biotin C - Ascorbic Acid (not in livestock) 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 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) 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 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 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 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