Intro to Livestock Nutrition Animal Production and Products Adv Animal Science.
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Intro to Livestock Nutrition
Animal Production and ProductsAdv Animal Science
Nutrition and Livestock
• Ruminants – animal with four-chambered stomachs– Cattle, sheep, goats, ungulates (deer, etc)
Nutrition and Livestock
• Non-ruminants– Monogastrics – single, simple stomach• Pigs, people
– Modified monogastrics – hindgut fermenters• Horses, rabbits
Nutritional Factors
• Nutrients– Six chemical types needed by organisms to survive
Nutritional Factors
• Nutrients– Carbohydrates• Chains of CHO’s• Sugars
– Plants store sugars as starches– Animals store sugars as glycogen
Nutritional Factors
• Nutrients• Monosaccharides = single sugars
Glucose, galactose, fructose
• Disaccharides = two-sugar sugarsLactose (glucose + galactose); Sucrose (glucose +
fructose)Maltose (glucose + glucose)
• Polysaccharides = many-sugar sugarsStarch, cellulose, glycogen (glucose chains)
Nutritional Factors
• Nutrients– Lipids• Fats and oils• Feeds
– Vegetable oils, oil seeds, animal fat
Nutritional Factors
• Nutrients– Protein• Needed for growth• Chains of amino acids
(essential vs nonessential)• Feeds
– Soybeans, soybean meal, legumes, animal protein
Nutritional Factors
• Nutrients– Vitamins• Organic compounds that facilitate body functions• Fat soluble
– A, D, E, K
• Water soluble– B (1-12), C
Nutritional Factors
• Nutrients– Minerals• Inorganic compounds needed
for bodily functions• Macro versus micro (trace
elements)• Toxicity vs Deficiency
– Copper toxicity in sheep– Selenium deficiency in sheep
Nutritional Factors
• Nutrients– Water• Sheep – up to 2 gallons/day• Cattle – 5-15 gallons/day (lactating Holsteins: 27
gallons a day)• Swine – market hogs require 2.5 gallons/day (sows can
need up to 6 gallons/day)• Horses – 8-15 gallons/day
Energies
• Gross Energy (GE)– Total energy in the feed
unit– Example: 500
kcal/pound– 1 calorie = energy to
heat 1 gram/ml of water 1 degree C
Energies
• Digestible Energy (DE)– DE = GE – Fecal Energy• Fecal energy is energy found in the fecal matter that
passed through the animal• Some feeds more digestible than others
– Example: if GE= 500 kcal, and fecal energy = 200 kcal, then DE = ?
Energies
• Metabolic Energy (ME)– ME = DE – Urinary energy – rumen gas energy• Rumen gas loss energy is usually in the form of
methane, by product of microbes
– Example: If DE = 300 kcal, and urinary energy = 18 kcal, and rumen gas energy is 36 kcal, then ME = ?
The metabolizability of DE is usually ~82%
Energies
• Net Energy (NE)– NE = ME – Heat loss/increment• Heat lost as part of the digestion process
– Example: If ME = 246 kcal, and heat loss is 32 kcal, then NE = ?
Energies
• Net Energy (NE)– NE is the energy available for 1) maintenance of
the animal and 2) production/growth
Energies
• The point?– The type of feed we feed, and the amount of
energy present in that feed, affects how much energy the animal has to use to carry out its functions!
Types of Feeds
• Roughages– Heavy cellulose forages (grasses, hays, silage)– Typically long-stemmed
• Concentrates– Grains high in starches (corn, oats, rye, etc)
Types of Feed
1) Alfalfa pellets2) Rice bran3) Beet pulp pellets4) Soybean meal5) Alfalfa cubes6) Cottonseed meal7) Chopped hay8) Wheat bran9) Whole oats10) Iodized salt11) Rolled oats12) Trace mineral salt13) Whole barley
14. Salt w/selenium15. Rolled barley16. Rye17. Whole corn18. Wheat19. Cracked corn20. COB (a=wet, b=dry)21. Rolled corn22. Molasses23. Linseed meal24. Flax25. Crimped oats
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