[Effect of 17 alpha hydroxy-20 beta dihydroprogesterone and progesterone on maturation and ovulation in vivo and on the plasma level of gonadotropic hormone t-GtH in rainbow trout Salmo gairdneri].
Ovulation occurred 5 to 9 days after injection of 2 mg/kg 17 alpha-hydroxy-20 beta dihydroprogesterone (17 alpha-20 beta Pg) in rainbow trout with oocytes in which the germinal vesicle was subperipheral. Whereas oocyte maturation was initiated by 17 alpha-20 beta Pg without an immediate increase in the concentration of t-GtH, in controls an increased level was found to coincide with initiation of the process and the concentration of t-GtH was higher at all stages. Progesterone treatment was less effective.
D004092:20-alpha-Dihydroprogesterone / Q000031:analogs & derivatives* / Q000494:pharmacology; D000818:Animals; D005260:Female; D006062:Gonadotropins / Q000097:blood; D009865:Oocytes / Q000187:drug effects*; D009866:Oogenesis / Q000187:drug effects; D010060:Ovulation / Q000187:drug effects*; D010063:Ovum / Q000187:drug effects*; D011374:Progesterone / Q000031:analogs & derivatives* / Q000494:pharmacology*; D012487:Salmonidae / Q000502:physiology*; D013268:Stimulation, Chemical; D013997:Time Factors; D014337:Trout / Q000502:physiology*
D006062:Gonadotropins; D004092:20-alpha-Dihydroprogesterone; D011374:Progesterone
Action de la 17 alpha hydroxy-20 beta dihydroprogestérone et de la progestérone sur la maturation et l'ovulation in vivo et sur le niveau d'hormone gonadotrope plasmatique t-GtH chez la Truite Arc-en-ciel Salmo gairdneri