Pearce D T, Oldham C M
School of Agriculture (Animal Science), University of Western Australia, Nedlands.
Aust J Biol Sci. 1988;41(1):23-6.
The pattern of ovulation of Merino ewes was studied by repeated laparoscopy each 14 days in the anoestrous (n = 97) and breeding (n = 87) seasons. In the anoestrous season the proportion of ewes ovulating did not decrease below 11%, 42% of ewes never ovulated and the remainder fluctuated between the two states. On 20 occasions a clear anovulatory period was interrupted by an isolated spontaneous ovulation. In the breeding season the overall mean proportion of ewes with corpora lutea or albicantia at laparoscopy was 87%, 54% of ewes ovulated regularly throughout while in another 31% absence of corpora lutea or albicantia coincided with the follicular phase of an oestrous cycle as evidenced by an appropriately aged corpora lutea at the next laparoscopy. Of the remaining 15% of the flock 3% had anovulatory periods greater than 14 days while the remainder experienced irregular ovulatory cycles--the majority due to short periods of anovulation but some ewes retained corpora lutea for longer than 14 days while others ovulated twice between successive laparoscopies.
在休情期（n = 97）和繁殖期（n = 87），通过每14天重复进行腹腔镜检查，对美利奴母羊的排卵模式进行了研究。在休情期，排卵母羊的比例未降至11%以下，42%的母羊从未排卵，其余母羊在两种状态之间波动。有20次，明显的无排卵期被孤立的自发排卵打断。在繁殖期，腹腔镜检查时黄体或白体母羊的总体平均比例为87%，54%的母羊在整个时期规律排卵，而在另外31%的母羊中，无黄体或白体与发情周期的卵泡期一致，这在下一次腹腔镜检查时可见到适当老化的黄体。在其余15%的羊群中，3%有无排卵期超过14天，其余母羊经历不规则排卵周期——大多数是由于短时间无排卵，但一些母羊的黄体保留时间超过14天，而另一些母羊在连续两次腹腔镜检查之间排卵两次。
