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Plasma Progestins Estradiol, and Luteinizing Hormone Following Prostaglandin F₂ Injection^{1 ,2,}

Dairy Science³
Obstetrics and Gynecology⁴ Departments, University of Florida, Gainesville 32611

ABSTRACT

Dairy animals, ranging from days 8 to 13 of the estrous cycle, were fitted with indwelling jugular catheters 1 day prior to either intramuscular injection of prostaglandin F₂ free acid (30 mg, n = 4) or intrauterine deposition of prostaglandin F₂ free acid (10 mg, n = 3). Blood samples were collected at 6, 4, 2, and 0 h prior to administration of prostaglandin F₂ and at 1, 3, and every 2 h thereafter until ovulation. Progestins, estradiol, and luteinizing hormone in plasma were measured by radioimmunoassay. Hormonal changes and interrelationships within animals were evaluated by least squares analyses. Decreases in progestins of plasma within 24 h indicated prostaglandin F₂ induced luteolysis in six of the seven animals. Estradiol increased linearly from time of injection to 52 h postinjection. Intervals from administration of prostaglandin to onset of estrus, peak of luteinizing hormone, and ovulation were 74.9 ± 21, 78.8 ± 21, and 99.5 ± 19 h.

¹ Florida Agricultural Experiment Station Journal Series No. 8078.

² Supported in part by a Biomedical Science Grant, National Institute of Health, Bethesda, MD 20014.