Influence of the presence of rams on the timing of ovulation and discharge of LH in ewes.
The influence of the presence of the male on the ovulation process was investigated in ewes after oestrus control by progestagens (intravaginal fluorogestone acetate) and PMSG. Permanent contact with the rams throughout oestrus accelerates the ovulation and the appearance of the LH surge. The results suggest that the action of the presence of the male on ovulation is mediated by way of the ovulatory surge of LH.
D000818:Animals; D004971:Estrus / Q000187:drug effects; D005260:Female; D006064:Gonadotropins, Equine / Q000494:pharmacology; D008297:Male; D010060:Ovulation; D010902:Pituitary Gland / Q000378:metabolism*; D010903:Pituitary Gland, Anterior / Q000378:metabolism*; D011247:Pregnancy; D011372:Progestins / Q000494:pharmacology; D012756:Sheep / Q000502:physiology*; D013997:Time Factors
D006064:Gonadotropins, Equine; D011372:Progestins