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Testosterone Concentrations in Plasma of Dairy Cows with Ovarian Cysts¹

Department of Dairy Husbandry and Veterinary Medicine and Surgery, University of Missouri, Columbia 65201

ABSTRACT

Testosterone in plasma was measured by radioimmunoassay in cows with ovarian cysts and in cows during the estrous cycle. Concentrations of testosterone in plasma (60.8 ± 2.7 pg/ml; mean ± standard error) in cows with ovarian cysts were variable but within the range in cows during the estrous cycle. Mean concentrations of testosterone in plasma increased from 46.3 pg/ml at estrus to 85.1 pg/ml on day 13 of the estrous cycle. In cows with ovarian cysts, concentrations of testosterone in plasma declined within 24 h following prostaglandin F₂ and tended to increase by 9 days following gonadotropin releasing hormone. The role of testosterone in estrual behavior and inhibiting resumption of ovarian cycles is likely minimal.

¹ Journal Paper No. 8358, Missouri Agriculture Experiment Station, University of Missouri, Columbia. Approved by the Director.

² Animal Genetics Laboratory, Department of Animal Science, University of Illinois, Urbana 61801.