ANSC 23000 Lecture Notes - Lecture 12: Hypocalcaemia, Mastectomy, Centrifugation
12 Dec 2016
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Document Summary
Dairy cattle energy balance: you expend the same amount of energy that you take in the diet. Zero: no weight change, typically when they give birth. Negative: lose weight, takes from fat: might not show ovulation. Nadir: the lowest point of anything: postpardom-anestrus after. If not fed right then female dairy cows can stop having estrus cycles. Reproduction can begin on the up swing (not always @ 0: beef cow takes longer to start ovulation than dairy cow because of nursing calves causing brain to be in a refractory period. Periparturient: energy balance around time of birth. 1:1000, cal in humans and kcal in cows. 80% water in pig; water is huge for milk production. Cow composition: 4% protein, 3% fat, 5% carbs (lactose), 12% ash (minerals), 88% water. Fat shows most variation among animals: cats have 10. 8% fat in their milk, whales have 30-50% fat in their milk. Different length and make-up depending on the animal.
