Quirke J F, Stabenfeldt G H, Bradford G E
University of California, Davis USA.
Theriogenology. 1983 Feb;19(2):243-8. doi: 10.1016/0093-691x(83)90010-9.
The establishment of ovarian activity during lactation was studied in the postpartum period of Rambouillet, Dorset and Finnish Landrace ewes following lambing during the month of October (1981). The mean postpartum intervals to first ovulation and first estrus were 22.7 and 53.0 for Rambouillets, 25.2 and 51.0 for Dorsets, and 22.5 and 49.7 days for Finnish Landrace ewes. Estrus was not associated with the first ovulation postpartum in any breed. The number of silent ovulations prior to the first estrus was highest in the Rambouillet and lowest in Finnish Landrace breeds. Of the 18 ewes in the project, 14 had normal luteal phase lengths, 1 had a possible short luteal phase and 3 had prolonged luteal phases following the first ovulation postpartum. The first service conception rate of all ewes bred was 82% (14 17 ) at an average of 52 days postpartum. The lambing rate following the autumn breeding was higher (2.14 +/- 0.14) than the lambing rate which followed the previous spring breeding (1.28 +/- 0.11).
1981年10月产羔后，对朗布依埃羊、多塞特羊和芬兰长白母羊产后哺乳期卵巢活动的建立情况进行了研究。朗布依埃羊产后至首次排卵和首次发情的平均间隔时间分别为22.7天和53.0天，多塞特羊为25.2天和51.0天，芬兰长白母羊为22.5天和49.7天。在任何品种中，发情都与产后首次排卵无关。首次发情前安静排卵的数量在朗布依埃羊中最高，在芬兰长白品种中最低。该项目的18只母羊中，14只黄体期长度正常，1只可能黄体期较短，3只产后首次排卵后黄体期延长。所有配种母羊的首次输精受胎率在产后平均52天时为82%（14/17）。秋季配种后的产羔率（2.14±0.14）高于前一年春季配种后的产羔率（1.28±0.11）。
