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Journal of Dairy Science Vol. 50 No. 7 1097-1100
© 1967 by American Dairy Science Association ®
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Effect of Feeding Thyroprotein to Dairy Cattle in a Subtropical Environment on Milk Composition and Production, Rumen Metabolism, and Fatty Acid Composition of Milk Fat1

R. W. Stanley and K. Morita

Department of Animal Sciences, University of Hawaii, Honolulu

ABSTRACT

A trial using five control and five treatment animals was conducted, feeding 2.47 g of thyroprotein (Protomone) per 100 kg body weight for a 6-wk period. Treatments were continuous. Animals went on trial approximately two months after parturition. Concentrates were fed ad libitum to both groups. Thyroprotein was fed once daily. The adjusted mean production (kg per day) for the control and thyroprotein-fed animals was milk, 17.2 and 22.8**, 4% FCM, 17.3 and 22.4**; fat, 0.70 and 0.88**; total solids, 2.28 and 3.03**, SNF, 1.57 and 2.11s; protein, 0.62 and 0.76**. The milk protein content was significantly lower for the thyroprotein-fed animals. Rumen volatile fatty acids were significantly different. Thyroprotein feeding caused an increase in propionate and decrease in the butyrate content of the rumen. Milk fat analysis showed significant differences in the C12, C14, C16, and C181= fatty acids. Thyroprotein feeding caused a decrease in the saturated and an increase in the unsaturated fatty acids in milk fat. Feed consumption was not significantly different. Rectal temperatures were significantly higher and body weight loss significantly greater for the thyroprotein-fed animals.

FOOTNOTES

1 Approved by the Director of the Hawaii Agricultural Experiment Station as Technical Paper no. 848.






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Copyright © 1967 by the American Dairy Science Association ®.