The Influence of a Synthetic Thyroprotein when Fed to Dairy Cows over an Extended Period

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Abstract
The daily feeding of 10 g. of thyroprotein to 9 cows resulted in an initial increase of 7.6% in milk production; 5 cows receiving 15 g. of thyroprotein daily increased 19.7% in milk production. In 3 of 4 cows receiving thyroprotein, the withdrawal and refeeding of thyroprotein resulted in a marked decrease in milk production and then a return to the pre-withdrawal level. The cow not returning to the pre-withdrawal level was not fed thyroprotein at the previous level. Of 9 dairy cows that received either 10 or 15 g. of thyroprotein daily for periods varying from 3 to 17 months, 6 secreted milk with a higher fat content and 6 produced more milk than that secreted in a similar segment of either a previous or a subsequent lactation. Of the 3 cows not showing an increase in milk production during the entire thyroprotein feeding period, only 1 failed to show an initial response in milk production.

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