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Dairy Husbandry Besearch Branch, U. S. Department of Agriculture, Beltsville, Maryland
ABSTRACT
It has been amply demonstrated that milk production will usually increase after the administration of thyroactive materials. The subject has been adequately summarized in recent reviews (4, 5, 12). A permanent increase in the level of milk production apparently does not persist throughout the entire lactation period (1, 6, 8, 10, 13). Most of the results have indicated that the feeding of thyroactive materials for the greater portion of the lactation period has not resulted in an increase in the total milk produced for the entire lactation (1, 6, 8, 9, 13).
The use of thyroprotein3 to increase milk production for short periods of time has received recent attention (11, 14). It has resulted in an economic advantage which was dependent on the degree of response in milk production during thyroprotein feeding and the decrease after thyroprotein feeding. The large decrease in milk production that occurred after the cessation of thyroprotein feeding was a deterrent to the use of the material.
1 Present address: Huntley, Mont.
2 Present address: University of Montana, Bozeman.
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