ANSC 4100 Lecture Notes - Lecture 2: Basal Metabolic Rate, Homeothermy, Evaporation

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Biological effects of temperature: changes in rates of enzymatic reactions and other chemical reactions, effects of noncovalent bonds, physical damage from protein denaturation or boiling, physical damage from ice crystals, evaporative water loss, the heat balance equation. The maintenance of a constant body temperature depends on the equation: M metabolic heat production in the body. L heat lost back to the environment. Temperature and heat are not the same: heat is a form of energy (added/removed)= joules/calories. Bmr for a homeothermic animal: in a post-absorptive state (food metabolized: at rest (not sleeping, without physical or psychological stress in a thermoneutral environment. Bmr is not the lo(cid:449)est (cid:373)eta(cid:271)oli(cid:272) rate! sleepi(cid:374)g, star(cid:448)atio(cid:374), hi(cid:271)er(cid:374)atio(cid:374) are lo(cid:449)er. Bmr = 70 x bw^0. 75 kcal/d for a fasting, resting, non stressed animal. Daily maintenance heat production rate maintenance = constant body weight and composition. This includes bmr, daily heat produced during feeding, in a thermoneutral environment but.

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