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Journal of Dairy Science Vol. 65 No. 6 920-926
© 1982 by American Dairy Science Association ®
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Lipotropic Effect of Estradiol-17 ß in Fed and Fasted Lactating Cows

B. Laarveld1, B. De Lorme2 and D. E. Kerr1

Department of Animal Science, Macdonald College of McGill University, Ste. Anne de Bellevue, Quebec, Canada H9x 1CO

ABSTRACT

The lipotropic effect of estradiol-17ß was measured in seven nonpregnant Holstein-Friesian cows 2 to 5 wk into lactation. The experiment was divided into an initial 3-day control period, 19 days treatment, and 2 days fast. Jugular blood samples were taken twice daily during the control period, the last 2 days of treatment, and the fast. After the control period, four cows received daily injections of estradiol-17ß benzoate (15 mg) in sesame oil for the remainder of the experiment whereas three cows received injections of sesame oil only. Estradiol-17ß did not change triglyceride concentration of plasma during the treatment period but increased it markedly during fast. Estradiol-17ß increased the free glycerol concentration of plasma during treatment. Cholesterol concentrations of plasma showed a consistent trend lower in the estradiol group during treatment and fast. No differences were apparent in glucose and blood ketone concentrations. The concentration of insulin in plasma was lower for the estradiol group during treatment. Estradiol-17ß appears to have a similar effect on lipid metabolism in dairy cows to other species. However, it exerted a strong lipotropic effect only under fasting.

FOOTNOTES

1 Department of Animal and Poultry Science, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 0W0.

2 Département d'Anatomie et de Physiologie Animales, Faculté de Médecine Vétérinaire, Université de Montréal, Ste. Hyacinthe, Quebec, Canada J2S 7C6.






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Copyright © 1982 by the American Dairy Science Association ®.