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Thyroprotein Feeding to Dairy Cows During Successive Lactations

Bureau of Dairy Industry, U. S. Department of Agriculture, Washington, D. C.

ABSTRACT

A large number of reports have been published on the feeding of thyroprotein to animals since the product has become available for experimental and practical use. It had been shown previously that dried or fresh thyroid tissue when fed to the cow would cause an increase in the level of milk production (9, 11, 12). Thyroxine was shown to be the active ingredient causing the increased milk yield (10). Investigations after this time were performed mainly to demonstrate that there was an increase in the milk and fat production after the thyroid or thyroprotein material was fed. Since then many trials have been carried out over short periods of time and were concerned with many and varied aspects of the subject. Several reviews have appeared, in which both the subject material and the literature references have been adequately given (7, 17).

This experiment was set up to obtain information on cows that were fed thyroprotein for each of several successive lactations.