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A Study of Feeding Low Levels of Thyroprotein to Dairy Cows for a Period of Fifty-Two Weeks^1,2

Pennsylvania Agricultural Experiment Station, State College

ABSTRACT

Thyroprotein in the form of iodinated casein fed at levels of 0.625, 1.25 and 5.0 g. daily to dairy cows with a T.D.N. intake of 125 per cent of Morrison's standards for good cows under usual conditions (10) produced no significant stimulation of milk production, milk fat production, heart rates, respiration rates or body temperatures. Gains in body weight and breeding efficiencies were not affected significantly.

These same levels of thyroprotein feeding accompanied by a T.D.N. intake of 110 per cent of Morrison's standards for good cows under usual conditions (10)produced increases in milk production which approached statistical significance. Milk production appeared to decline when thyroprotein was withdrawn from the ration. Mean milk fat percentage, body weights, heart rates, respiration rates, body temperatures and breeding efficiencies were not affected significantly by these levels of thyroprotein administration.

¹ Taken from data presented in a thesis to the graduate faculty of The Pennsylvania State College by R. G. Swanson in partial fulfillment of the requirements for the Degree of Master of Science. Authorized for publication on August 23, 1948 as paper No. 1464 in the journal series of the Pennsylvania Agricultural Experiment Station.

² The authors wish to express their appreciation to the Whitmoyer Laboratories, Inc., Myerstown, Pa. for a research grant and to the Cerophyl Laboratories, Inc. which supplied the iodinated casein for this study.