【摘要】 应用Aloka 210 F电子扫描超声诊断装置,频率为3.0MHz的大家畜用直肠探头,对13匹小型母马早期怀孕的胚胎发育进行了探查,最早在排卵后12～16 d探到了胎囊。21 d可见胚胎,22 d可见胎心搏动,39 d可见胎动。虽然脐带与尿囊膜绒毛膜的联系总是在胎囊背侧,但胎膜的发育无固定形式。因此,应每天测定胎囊直径、胚胎及胎儿的长度。更多还原

【Abstract】 The embryomic developments during the early pregnancy in 13pong mares were studied using Aloka 210 electronic ultrasound scanning, whose probe had been modified for using in big amimals and thefrequency was 3.0 MHz .The results were listed as follows: The earliestconceptus and embryoes were not found until 12 to 16 days and 21 daysagter the ovulation.respeitively.The heart beats of the emtryoes andthe movement of the foetus were only Visulized after 22 days and 39days,respeitively.Althongh the attachment of the umbilical cord to theallantochorion was always on the dorsal part of the conceptus,adefmite pattern was not found in the development of the foetalmemtranes.As aresult,the diameter of the conoplus.the length of theemlryo and the fottus should be measured daily.更多还原