摘要
Pregnancy rate following artificial insemination (AI) in sheep is variable depending on several factors. The Churra breed (milk breed of the North-West of Spain) yields lower fertility results compared with other local and European breeds (Manchega, Latxa, Merino, Lacaune, Sarde, etc.). In this work we studied the influence of many factors on the fertility of the Churra breed (insemination technique, year, farm, age, male, number of inseminations per ewe, lambing-insemination interval and technician), analyzing lambing data obtained after 44448 inseminations (39.67% cervical AI via vagina, AIV, and 60.33% intrauterine AI using laparoscopy, AIL) in a categorical model. The most important factors influencing fertility after AI were farm, year, season, AI technique, and technician. AIL showed significantly higher fertility results than AIV (44.89% versus 31.25%). Season significantly affected fertility in both cases, but differences were more evident in AIV. Fertility dropped 1.74% (AIV) and 2.07% (AIL) per year as the ewes aged. Finally, AI fertility decreased when the lambing-insemination interval was lower than 10 weeks.
摘要译文
人工授精（AI）在羊中的怀孕率取决于几个因素。与其他地方和欧洲品种（Manchega，Latxa，Merino，Lacaune，Sarde等）相比，Churra品种（西班牙西北部的牛奶品种）的生育率较低。在这项工作中，我们研究了许多因素对Churra品种（受精技术，年，农场，年龄，雄性，每母羊授精数量，羔羊授精间隔和技术人员），分析44448次授精后获得的羔羊数据（39.67％宫颈AI通过阴道，AIV和60.33％宫内AI使用腹腔镜，AIL）在一个分类模型。 AI后影响生育的最重要的因素是农场，年，季节，AI技术和技术人员。AIL显示出比AIV显着更高的生育率结果（44.89％比31.25％）。在这两种情况下，季节都显着影响生育力，但在AIV中差异更为明显。生育率下降1。年龄为74％（AIV）和2.07％（AIL）。最后，当羔羊授精间隔低于10周时，AI生育力下降。
L.Anel[a];M.Kaabi[a];B.Abroug[a];M.Alvarez[a];E.Anel[a];J.C.Boixo[a];L.F. de laFuente[b];P. dePaz[c];. Factors influencing the success of vaginal and laparoscopic artificial insemination in churra ewes: a field assay[J]. Theriogenology, 2005,63(4): 1235-1247