FERTILITY OF FROZEN BOAR SEMEN USED FOR AI IN COMMERCIAL SETTINGS

Surgical insemination was the least efficient means to procure offspring (27% farrow rate). However, it offers to be an effective means for generating offspring from limited semen supplies or semen having high value (i.e. genetic merit or gender selected sperm). Transcervical AI resulted in an overall 40% farrow rate. However, there was a significant farm effect observed and this was anticipated in considering the variation in management and personnel practices.
The application of frozen boar semen for commercial practice has merit. Although the fertility of frozen semen is below that of fresh semen, it is a low cost and efficient method for introgressing new germplasm (genetics) into a current genetic base. With respect to seedstock suppliers, the lowered fertility associated with frozen semen is acceptable when it is looked upon as a means to introduce new genetics for research purposes.     

影响精液质量的几个冷冻技术因素

本文提出冷冻精液生产工艺的技术关键是由冷冻温度和降温速度所构成的精液冷冻温度曲线，通过对国内１５个省，市级牛冷冻精液生产单位的生产工艺程序进行监测，对细管型及颗粒型精液冷冻温度曲线的类型，存在的问题及其影响因素进行了分析研究，提出了提高牛冷冻精液质量的建议。