Acute heat stress brings down milk secretion in dairy cows by up-regulating the activity of the milk-borne negative feedback regulatory system
In hot climates, high ambient temperatures, high direct and indirect solar radiation, and wind speed and humidity are the main environmental stressing factors that impose stress on animals. Cattle
have a higher metabolic rate than most other domestic ruminants, and a poorly developed water retention mechanism in the kidney and gut.
Milk secretion and mammary function are regulated acutely by local autocrine feedback mechanisms that involve milk-borne factors which are sensitive to the frequency and efficiency of milking. Sustained changes in the frequency of milking and milk secretion are associated metabolic adaptation.
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