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Thyroprotein for Dairy Cattle

Dairy Cattle Research Branch, AH Division, ARS, USDA, Beltsville, Maryland

ABSTRACT

Thyroprotein is a hormone-containing product which produces an increase in milk production when fed to dairy cattle. The question of whether the increase in milk production is sustained, along' with other questions of feeding the product, is discussed in the following presentation. The product has been available commercially since about 1945; its sale has varied considerably from time to time and from locality to locality and reached a minimum about 1954. Recent sales effort has increased the use of the product in some areas.

The product is manufactured by the iodination of casein under certain specified conditions. The active agent in the product is the hormone, thyroxine, the same hormone that is secreted by the thyroid gland. The thyroprotein is usually mixed with some feedstuff and sold as a supplement to be fed in addition to the usual ration.

The most recent technical review of the various aspects of feeding thyroprotein to dairy cattle was published by the National Research Council (5).