Hanzen C, Delsaux B
Université de Liège, Faculté de Médecine Vétérinaire, Service d'Obstétrique et des Troubles de la Reproduction, Brussels, Belgium.
Vet Rec. 1987 Aug 29;121(9):200-2. doi: 10.1136/vr.121.9.200.
A 3 MHz ultrasonic transducer was used to make pregnancy diagnoses in 320 milk and beef cows and heifers, on average 41 days after the last insemination. The ultrasound diagnostic findings were systematically confirmed by rectal palpation. Signs of pregnancy were detected as early as the 25th day after insemination. Discounting 16 doubtful results, the accuracy of positive diagnosis (94 per cent) was better than negative diagnosis (89.7 per cent). Ultrasound scanning could be used for the study of embryo mortality or for the determination of fetal age.
使用一台3兆赫的超声换能器，对320头奶牛和小母牛进行妊娠诊断，这些牛平均在最后一次输精后41天接受检查。超声诊断结果通过直肠触诊得到系统确认。早在输精后第25天就检测到了妊娠迹象。排除16个可疑结果后，阳性诊断的准确率（94%）高于阴性诊断（89.7%）。超声扫描可用于研究胚胎死亡率或确定胎儿年龄。
