The effect of continued treatment with anterior pituitary extracts on milk volume and milk-fat production in the lactating cow

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Abstract
Repeated injs. of thyrotropic and prolactin preps. into cows in declining lactation resulted in a pronounced increase in milk yield. the increase being more marked with the prolactin prep. The increase in milk yield following injs. of the prolactin prep. was accompanied by a substantial increase in milk-fat content. The avg. daily production of milk-fat was increased by nearly 50% during the period of 5 successive injns. of prolactin. Under prolonged treatment with prolactin the milk yield did not continue to increase, but reached a steady level and then declined, despite continued treatment. The increase in milk yield and milk-fat content of cows in declining lactation, following the inj. of pituitary-extracts, cannot be ascribed to the action of a single substance.

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