Changes in the concentrations of steroids and prostaglandin F in preovulatory follicles of the mare after administration of hCG.
Fluid was aspirated from the preovulatory follicle of Group 1 mares (N = 6) when follicles reached 32-34 mm in diameter. Group 2 mares each received an i.v. injection of hCG when the preovulatory follicle reached 35 mm. Aspiration of follicular fluid was performed 28-32 h after treatment. Follicular fluid was aspirated from Group 3 mares 28-32 h after the preovulatory follicle reached 35 mm in diameter. Concentrations of progesterone were significantly higher in follicular fluid from Group 2 mares than in that from mares in Groups 1 and 3. Testosterone was significantly higher in follicular fluid from Groups 2 and 3 than in Group 1 mares. There were no significant differences among groups in concentrations of oestradiol and prostaglandin F (PGF) in follicular fluid.
Watson
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ED
University of Pennsylvania, Section of Reproductive Studies, New Bolton Center, Kennett Square 19348.
Hinrichs
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K
D000818:Animals; D006063:Chorionic Gonadotropin / Q000494:pharmacology*; D005260:Female; D005498:Follicular Phase; D012739:Gonadal Steroid Hormones / Q000378:metabolism*; D006736:Horses / Q000502:physiology*; D006080:Ovarian Follicle / Q000187:drug effects / Q000378:metabolism*; D011374:Progesterone / Q000378:metabolism; D011460:Prostaglandins F / Q000378:metabolism*; D013739:Testosterone / Q000378:metabolism
D006063:Chorionic Gonadotropin; D012739:Gonadal Steroid Hormones; D011460:Prostaglandins F; D013739:Testosterone; D011374:Progesterone