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Thyroid Supplementation at Peak of Lactation^{1, 2,}

Department of Dairy Science New Jersey Agricultural Experiment Station, New Brunswick

ABSTRACT

The daily feeding of three additional pounds of grain plus 1.2 g. thyroprotein per 100 lb. of body weight for 13 days to ten dairy cows at the peak of lactation increased milk production 9.9%. The daily feeding of three additional pounds of grain without thyroprotein for 13 days to eight similar dairy cows increased milk production only 1.1%. An analysis of variance showed that the between-group comparisons were highly significant (P < 0.01). The results suggest that thyroid secretion rate may be a limiting factor in milk secretion at the peak of lactation.

¹ Paper of the Journal Series, New Jersey Agricultural Experiment Station, Rutgers—The State University, Department of Dairy Science, New Brunswick.

² This study was supported by a grant from the Frelinghuysen Foundation.