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Journal of Dairy Science Vol. 54 No. 10 1499-1504
© 1971 by American Dairy Science Association ®
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Method for Experimental Induction of Ketosis Utilizing the Interaction of Low Energy Intake and Thyroxine1

D. W. Kellogg, C. J. Balok2 and D. D. Miller

Dairy Department, New Mexico State University Las Cruces 88001

ABSTRACT

A method of successfully inducing experimental ketosis in lactation dairy cows within nine weeks postpartum was developed. Animals were on a low-energy ration providing 90% of their protein and 30% of their energy requirements for 8 days. On the fourth through seventh days the cows were injected with L-thyroxine (sodium) pentahydrate at a daily dosage of 6.9 mg per 100 kg of initial body weight. The animals exhibited typical bovine ketotic signs of lethargy or excitability or both, dull eyes, anorexia, decreased milk production, and increased fat percentage. Blood glucose decreased to a mean of 15.4 mg per 100 ml and total ketones, acetone, and free fatty acids increased to means of 34.3, 26.2, and 10.7 mg per 100 ml.

The effect of either thyroxine injections or low-energy ration alone on animal performance and blood components was determined. Some undesirable effects were noted. However, a combination of both thyroxine injection and low-energy ration produced greater effects than either of these factors by themselves. Only the animals on the combined treatment developed all physiological signs of bovine ketosis.

FOOTNOTES

1 Journal Article 382, Agricultural Experiment Station, New Mexico State University, Las Cruces.

2 Present address: Department of Animal Science, Washington State University, Pullman.






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Copyright © 1971 by the American Dairy Science Association ®.