摘要
The reproductive responses to one and two inseminations of frozen-thawed semen were compared in fat-tailed ewes which had previously been used in controlled reproduction programs aimed at estrus synchronization, multiple ovulation embryo transfer, and out of breeding season. In the trials, mature dry (n = 50) ewes in progestagen-induced estrus were inseminated 54 to 56 h after sponge removal. Half of the ewes received a second insemination 6 or 8 h later. The quality of the semen was determined by evaluating sperm motility after thawing. Association between factors included in this study and sex ratio was also investigated. The previous breeding programs effected ewe’s subsequent fertility and the range in lambing rates observed was from around 33% to over 75%. Higher (P < 0.05) lambing rate (56% versus 29%) and litter size (1.8 versus 1.2) indicated an advantage of two inseminations. Post-thaw evaluation of frozen semen was good indicator to achieve acceptable pregnancy rate. Sex ratio was significantly affected by the previous breeding program, one or two inseminations, and postthaw quality of frozen semen.
摘要译文
将冷冻解冻精液的一个和两个强制性的生殖反应进行比较，脂肪尾母羊在先前用于受控繁殖计划，旨在患有雌雄同体同步，多次排卵胚胎转移和繁殖季节。在试验中，在海绵移除后，孕激素诱导的雌激素的成熟干燥（n = 50）eWES在54至56小时中被巩固了54至56小时。母羊的一半以后收到了第二个授精6或8 H.通过评估解冻后的精子活力来确定精液的质量。还调查了本研究中包含的因素与性别比率之间的关联。以前的繁殖计划影响了EWE随后的生育率，观察到的羔羊率的范围为约33％至超过75％。较高（P <0.05）羔羊率（56％，29％）和凋落物尺寸（1.8与1.2）表示两个蛋白质的优势。解冻后精液的解冻评估是良好的指标，以获得可接受的妊娠率。性别比率受到先前的育种计划，一两个蛋白质和冷冻精液的后三锯的影响。
E. Emsen;C.A. Gimenez Diaz;M. Yaprak;F. Koycegiz;M. Kutluca;F.A. Aslan. Factors affecting the reproductive performance of fat-tailed ewes inseminated with laparoscopy in the late breeding season[J]. Animal Reproduction, 2008,5(1): 30-33