The action of thyroxine on the milk and milk-fat production of cows

Abstract

Thyroxine was shown to be the active principle in thyroid glands increasing the production of milk fat and milk when fed to cows past the peak of their secretion. If this effect were directly due to changes in metabolic rate, it should be reproducible with nitrophenols. The results of administration of small amts. of prolactin or dinitrophenol were inconclusive.