Follicular waves during the oestrous cycle in Nili-Ravi buffaloes undergoing spontaneous and PGF2alpha-induced luteolysis.
The objective of this study was to characterize the follicular waves and associated ovarian events during spontaneous and PGF(2alpha)-induced oestrous cycles in Nili-Ravi buffaloes. In Exp. 1, (n=13 oestrous cycles) follicular and luteal development was monitored by ultrasonography and jugular blood samples were collected simultaneously on alternate days. Of 12 oestrous cycles, 9 (75%) had two waves of follicular activity and only 3 (25%) had three waves. The mean (+/-S.E.M.) length of the oestrous cycle was shorter (P<0.05) in buffaloes with two waves than in those with three waves (21.2+/-0.1 days versus 22.8+/-0.1 days). In Exp. 2, follicular dynamics were compared in buffaloes undergoing spontaneous (n=12 oestrous cycles) and PGF(2alpha)-induced (n=9) regression of the corpus luteum (CL). The dynamics of ovulatory follicular growth during the 3 days before oestrus were similar (P>0.05) in buffaloes undergoing spontaneous and PGF(2alpha)-induced luteolysis. These results show that (1) the majority of buffaloes had a two wave pattern of follicular growth and emergence of a third wave was associated with a longer luteal phase, and (2) follicular dynamics during the 3 days before oestrus were similar in buffaloes undergoing spontaneous and PGF(2alpha)-induced luteolysis.
Warriach
Hassan Mahmood
HM
Department of Theriogenology, Faculty of Veterinary Science, University of Veterinary and Animal Sciences, Lahore, Pakistan.
Ahmad
Nasim
N
D000818:Animals; D002020:Buffaloes / Q000502:physiology*; D015237:Dinoprost / Q000494:pharmacology*; D030762:Estrous Cycle / Q000187:drug effects* / Q000502:physiology*; D005260:Female; D003341:Luteolysis / Q000187:drug effects*; D006080:Ovarian Follicle / Q000187:drug effects*
D015237:Dinoprost