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Journal of Dairy Science Vol. 56 No. 8 1047-1051
© 1973 by American Dairy Science Association ®
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Effect of Periodic Feeding of Thyroprotein on Milk Yield and Fat Test of Holstein Cows

G. H. Schmidt, J. D. Deverna and L. H. Kilmer1

Department of Animal Science, Cornell University, Ithaca, New York 14850

ABSTRACT

Thyroprotein was fed to two groups of cows at 1 g/45 kg body weight per day. One group of cows and first-calf heifers received thyroprotein for 5 days each month, and a second group of first-calf heifers received thyroprotein 10 days eash month for 9 mo. Milk yield was increased by .2 kg/day during the 5 days of thyroprotein feeding each month in comparison to the 5 days pretreatment whereas cows not receiving the hormone had an average daily decrease of .33 kg. The highest average daily increase in milk yield occurred during 5 days starting on the 4th day of hormone feeding and continuing through 3 days after its withdrawal and amounted to an increase of .79 kg in comparison to the 5 days pretreatment. The average daily increase in milk production of first-calf heifers fed thyroprotein for 10 days each month for the period starting on the 4th day of thyroprotein feeding and continuing for 3 days after its withdrawal was 1.06 kg in comparison to the 5 days pretreatment. Milk fat tests increased on the 3rd post-treatment day when the hormone was fed for 5 days and on treatment day 8 when it was fed for 10 days. Rectal temperatures of heifers receiving thyroprotein for 10 day of its feeding in comparison to pretreatment values. No significant changes in rectal temperature occurred in cows and heifers fed thyroprotein for 5 days.

FOOTNOTES

1 Present address: Towanda, Pennsylvania 18848.






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Copyright © 1973 by the American Dairy Science Association ®.