Bach S, Kähn W, Müller F, Schulz J, Geigenmüller S
Bezirksinstitut für Veterinärwesen Chemnitz, Universität München.
Tierarztl Prax. 1991 Aug;19(4):365-8.
In order to test the efficacy of ultrasonic diagnosis of early twin pregnancy, 20 dairy cows were inseminated, and 4-8 days later a seven-day old embryo was additionally transferred into the uterine horn contralateral to the site of ovulation. Sixteen of 20 cows became pregnant (80%). In 7 of 16 animals a twin pregnancy resulted (44%). Out of eight single pregnancies five (62.5%) followed insemination, and three (37.5%) followed egg transfer. Sixteen pregnant animals were examined ultrasonically. In 7 cases it was possible to estimate a twin pregnancy on the 41st day. This diagnosis was verified on parturition. The ultrasonically diagnosed side of pregnant horn in the singles was correct in 7 of 8 cases, identified by the genetical different origin of the offspring from artificial insemination or egg transfer.
为了测试超声诊断早期双胎妊娠的效果，对20头奶牛进行授精，4 - 8天后将一个7日龄胚胎额外移植到排卵部位对侧的子宫角。20头奶牛中有16头怀孕（80%）。16头动物中有7头发生双胎妊娠（44%）。在8例单胎妊娠中，5例（62.5%）是授精后妊娠，3例（37.5%）是胚胎移植后妊娠。对16头怀孕动物进行了超声检查。7例在第41天能够估计为双胎妊娠。这一诊断在分娩时得到证实。在8例单胎妊娠中，通过后代人工授精或胚胎移植的遗传不同来源确定，超声诊断的怀孕子宫角侧在7例中是正确的。
