冷冻牲畜精液是近二十年才发展起来的人工授精科学上的一门新技术,就是用干冰(-79℃)或液氮(-190℃)等超低温处理的方法将公牛的精液保存起来。使用冷冻精液可以充分发挥优良种公牛的利用率,扩大种头数,法、美、加等国一头种公牛平均可配母牛2000~2000头以上,新西兰每头种公牛的配种超过8000头母牛,美国有一头“海福特”公牛共配母牛238231头;冷冻精液可以长期保存,不受种公牛生 Frozen animal semen is a new technology in artificial insemination that was developed in the last two decades. It is to store the semen of bulls with cryogenic treatment such as dry ice (-79°C) or liquid nitrogen (-190°C). The use of frozen semen can give full play to the utilization rate of excellent breeds of bulls and increase the number of species. A bull in France, the United States, Canada and other countries can use an average of 2,000 to 2,000 cows or more, and each breed in New Zealand has more than 8,000 breeding stocks. In cattle, the United States has a “Heyford” bull with a total of 238,231 cows; frozen semen can be preserved for a long period of time, free from bulls