应用B超3.5 MHz探头体表监测拉布拉多犬妊娠

在B型超声二维成像的基础上，用频率3．5MHz电子凸阵扇型体表探头跟踪检测40条拉布拉多妊娠母犬，观察其胎儿发育规律，记录妊娠胚胎的各个胚外结构（孕囊等）、胚胎外形及胚内结构（胎心等）的首次检出时间。最早检测出孕囊、胎心搏动和胎盘的时间分别为18d、23d和31d，最早36d能测定完整骨骼系统，37d能识别大部分内脏器官。3．5MHz探头不能准确判断胎儿性别，判定胎儿数目困难。

Using B-mode Ultrasonic 3.5MHz Scanner Monitor Labrador Dog Gestation on the Belly Surface

On the basis of B-mode ultrasonic image,40 gestational Labrador dogs were monitored by 3.5 MHz scanner on the body surface,its pregnancy and the embryo's growth were observed,and the first time to examining out the structure of embryo outside,embryo appearance and the structure of embryo inside were recorded.The first time of measuring gestational sac,fetus heart beating and placenta out were 18 d,23 d and 31 d,respectively.The intact skeletal system could be detected on earliest 36 d,and most viscera organs could be determined on 37 d.The fetus' sex cannot be identificated by 3.5 MHz scanner accurately,and fetal numbers is difficult to be determined.