摘要
In this study, two successive field trials were conducted during the non-breeding season to investigate various factors affecting on fertility of Suffolk ewes after intrauterine insemination with frozen-thawed semen. In the first year (Experiment 1), three sperm numbers per insemination dose (0.25, 0.5 and 1 million sperm) and five sheep farms were used, and in the second year (Experiment 2), parity, age, body weight, body condition score (BCS) and postpartum days were investigated to compare pregnancy and lambing rates. High pregnancy and lambing rates (70.6 and 70.6%, respectively) were obtained with 0.25 million sperm per dose. There were no significant differences in the pregnancy and lambing rates among the five farms, but there was a tendency for one farm to have higher pregnancy (75.8%, P=0.065) and lambing (72.7%, P=0.077) rates than those (46.7-53.3% and 45.2-53.3% for the pregnancy and lambing rates, respectively) of the other farms. In Experiment 2, ewe age significantly affected both the pregnancy and lambing rates. Nulliparous ewes had a higher lambing rate (72.0%) than that (44.2%) of multiparous ewes, but a significant difference was not revealed. Regardless of body weight, BCS tended to be an important factor influencing on fertility of ewes. Body weight and the postpartum days did not affect the fertility of ewes. It was concluded from these results that the fertility of Suffolk ewes after intrauterine insemination with frozen semen was significantly influenced by sperm number per dose and ewe age. Nulliparous ewes at less than three years of age and with a BCS of more than 3.0 are expected to have higher fertility than other ewes.
摘要译文
在这项研究中，两个连续的田间试验是在非繁殖季节进行调查宫腔内人工授精与冷冻精液解冻后的影响在萨福克母羊的生育能力的各种因素。在第一年（实验1），每授精剂量（0.25,0.5和百万精子）和五个羊农场3精子号码被使用，并在第二年（实验2），奇偶校验，年龄，体重，体况评分（BCS）和产后天进行了研究比较妊娠和产羔率。高妊娠和产羔率（70.6和70.6％，分别）与每剂025万精子获得。还有在怀孕和五场之间没有显著差异产羔率，但有一个农场具有更高妊娠（75.8％，P \x3d 0.065）和产羔的倾向（72.7％，P \x3d 0.077）率比（46.7-53.3％和妊娠和产羔率45.2-53.3％，分别为）其他农场。在实验2，母羊年龄显著影响了怀孕和产羔率。未经产母羊有较高产羔率（72.0％）比（44。多子母羊的2％），但显著差异没有透露。不论体重，BCS趋于影响对母羊的生育率的重要因素。体重和产后天没有影响母羊的生育能力。得出的结论是，从这些结果可知沙福母羊子宫内授精与冷冻精液后的育性显著由每剂量和母羊年龄精子数的影响。未产妇母羊在不到三年的年龄，有超过3.0 BCS预计将有生育能力比其他母羊高。
Yutaka FUKUI[1]; Hirohide KOHNO[2]; Kentaro OKABE[2]; Sara KATSUKI[1]; Masahiro YOSHIZAWA[1]; Tetsuro TOGARI[3];Hiroyuki WATANABE[1]. Factors Affecting the Fertility of Ewes after Intrauterine Insemination with Frozen-Thawed Semen During the Non-Breeding Season[J]. Journal of Reproduction and Development, 2010,56(4): 460-466