Abstract

AbstractMilk synthesis and secretion have a high priority in the metabolism of the lactating cow. At peak lactation the nutrient needs of the mammary gland are of such magnitude relative to total metabolism that the udder has been compared with a parasite. The question arises: has the udder taken control of the cow? The aim of this study was to investigate whether the metabolic restriction point determining maximum milk output is localized at the level of the mammary gland itself or elsewhere in the body. The results indicate that the restriction point determining the maximum metabolic capacity is not localized in the udder as indicated by the ability of the mammary tissue to increase further its rate of milk secretion and therefore the maximum capacity is determined at the level of the whole body.

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