ANSC 1111 Lecture 8: Animal Nutrition Lecture 8 (Energy Balance)
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Calorie = heat req"d to increase 1g h2o 1oc. Same way as gross energy in diet. Amount of food that is digested by animal, minus fecal loss. Tdn = (cp*digestibility) + (nsc*digestibility) + (cf*digestibility) + 2. 25(ee*digestibility) Fecal and urinary energy loss- excreted together. = from microbes-- everything that is fermenting food that animal is eating. Tie stalls are not ideal for animals. Per animal per kg bw per kg/bw 0. 67 per kg/bw 0. 75. Heat production is roughly proportional to surface area. Heat production expressed per kg/bw 0. 75 = metabolic body size. Accounting for differences in skin folds, fluffiness, etc. Amount of energy required by body at rest. This energy is used for blood circulation, breathing, brain function, maintaining chemical gradient across cells (active transport; sodium potassium pumps ; Postabsorptive state (hi, hf ~ 0) = no food. Energy required for normal movement etc. above basal metabolism. Ruminant has higher fecal loss because ruminants eat a lot of non-digestible matter (herbivore)
