Coleman D A, Dailey R A, Leffel R E, Baker R D
J Dairy Sci. 1987 Apr;70(4):858-66. doi: 10.3168/jds.S0022-0302(87)80084-X.
Characteristics of donors, embryos, recipients, and transfer procedures were examined for relationships with establishment of pregnancy. Data were from records of 1202 embryos transferred by the professional staff of a large embryo transfer company. Average pregnancy rate was 74.6%. Variables affecting establishment of pregnancy were service sire, embryo quality, stage of estrous cycle in recipient, quadratic effect of synchrony, and transfer quality. Because the direct or indirect effect of sire must be established at conception, these data demonstrate a latent effect of sire on pregnancy. One would expect the highest pregnancy rate among excellent quality embryos transferred with no delays or complications into recipients that had displayed estrus at the same time or prior to the donor yet were relatively early in their estrous cycles. There also was a tendency for pregnancy rate to decrease with advancing maturity of the embryo.
对供体、胚胎、受体的特征以及移植程序进行了研究，以探讨它们与妊娠建立之间的关系。数据来自一家大型胚胎移植公司专业人员记录的1202次胚胎移植情况。平均妊娠率为74.6%。影响妊娠建立的变量包括种公牛、胚胎质量、受体发情周期阶段、同步性的二次效应以及移植质量。由于种公牛的直接或间接影响必须在受孕时确定，这些数据证明了种公牛对妊娠的潜在影响。人们预计，将优质胚胎及时、无延迟或并发症地移植到与供体同时发情或在供体之前发情且处于发情周期相对早期的受体中，妊娠率会最高。随着胚胎成熟度的提高，妊娠率也有下降的趋势。
