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1982年,北京农业大学陈兆英付教授与潘祯国等同志首次用超声波法对湖羊妊娠做了比较系统的诊断试验,获得成功。为了进一步探索超声波对奶山羊的妊娠诊断效果,
In 1982, Professor Chen Zhaoying and Pan Zhenguo of Beijing Agricultural University made the first systematic and diagnostic test on the pregnancy of Hu sheep with the ultrasonic method, and succeeded. In order to further explore the ultrasonic diagnosis of dairy goat pregnancy effect,