2010 Annual Report
This was the second year of the research to adapt the non-surgical artificial insemination (AI) technique to a small breed of sheep; namely the Black Welsh Mountain sheep. To investigate this adaptation the estrous cycle of 27 ewes was again synchronized using a controlled intravaginal drug release protocol (CIDR) and pregnant mare serum gonadotropin (PMSG) to induce ovulation (CIDR is a progesterone releasing device that releases the hormone slowly over a number of days and PMSG is a hormone). Artificial insemination of the ewes was performed using our adapted insemination device. Because of issues with the post-thaw quality of the semen and because of the lack of response to the synchronization protocol only one ewe conceived (4% fertility). These results indicate two important points for further research. First, because of the poor response to the estrous synchronization protocol, and based on other recently published reports, the CIDRs will no longer be used in favor of a naturally occurring estrous. Second, higher quality semen must be used to guarantee higher fertility. This can be achieved by collecting and freezing semen from the rams earlier in the season. Therefore, future experiments will incorporate both of these ideas into the experimental design. Project progress is monitored by regular phone contact, by a site visit in December 2009 for performance of the research, and by email.