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Effects of Gonadotropins, Oxytocin and Glucose on the Bovine Corpus Luteum at the Fourteenth Day of the Estrual Cycle¹

University of Wisconsin, Madison

Abstract

A total of 41 virgin heifers of dairy breeding were used to study the effects of ^{in vivo} treatment with FSH, oxytocin, HCG and bovine prolactin upon the ability of the CL to synthesize progesterone. There were no significant effects of oxytocin or prolactin alone. FSH treatment produced a significant depression of progesterone synthesis by luteal slices during incubation. HCG treatment in vivo led to a significant drop in initial progesterone concentration. HCG in vitro enhanced progesterone production (P<.01). Glucose in vivo or in vitro enhanced progesterone production by luteal slices during incubation when exogenous pregnenolone was present in the medium.

¹ Published with the approval of the Director of the Wisconsin Agricultural Experiment Station. Paper No. 986 from the Division of Genetics and No. 463 from the Department of Veterinary Science. This work was done under a cooperative agreement between the Wisconsin Agricultural Experiment Station and the Dairy Cattle Research Branch, USDA, and was supported in part by the Branch. Other support was given by grants from the National Institutes of Health, The Ford Foundation and The Upjohn Company.

² Post-doctoral Fellow of the National Institutes of Health.

³ Agent of the Dairy Cattle Research Branch, USDA.

⁴ The authors are indebted to the Endocrine Study Section, National Institutes of Health, for the supply of FSH and to The Upjohn Company for the supply of bovine prolactin.