tailieunhanh - Reproductive Technologies

Another result of FCSRCA has been the development of a model program for certification of embryology laboratories. The CDC published these requirements in 1999. They include requirements for administration of a continuing certification program by the states, quality assurance and control standards, an inspection system, and conditions under which certification can be suspended or revoked. Adoption of such a laboratory certification program is left up to the states. Food and Drug Administration The Food and Drug Administration (FDA) is responsible for protecting the public health by assuring the safety, efficacy, and security of drugs, biological products, and medical devices. Physicians working in reproductive medicine, as in other fields of medicine, can. | Reproductive Technologies Dr. Brian Buckrell Small Ruminant RRI Georgetown o rXGenetics s4C idl Most limiting factor in application of reproductive technologies to sheep production Complex sheep cervix causes reproductive techniques to be developed that are different from cattle are more difficult to apply are less effective and more costly. Still in good programs we achieve the same rates of success for AI and ET in sheep as the North American cattle industry. But what is required costs relatively more per lamb born as compared to the cost of technologies used in cattle . So the reasons for using reproductive technologies and the likely results need to be very clear. Within the sheep industry no group could benefit more from these techniques than the dairy sector. Benefits from Semen Programs Makes high value genetics available at low cost International movement of genetics High health genetics for closed flocks Increase return on high value genetics Increased breeding from selected rams Establishment of genetic improvement schemes sire referencing Artificial Insemination Fresh semen AI Programs Frozen semen AI Programs Evolution of AI for 5heep 1960s - Fresh semen Vaginal insemination Fresh semen Cervical insemination Frozen semen Laparoscopic AI - 1980s Semen freezing Trans cervical -1990s Frozen semen AI Improved fresh semen Next day AI Recent improvements to fresh semen to 48-72 hrs AI - 2000__ Location of Insemination Vagina easy reduced success only used with fresh semen Cervix more difficult - sheep success increases as penetration increases use fresh and frozen semen Uterus very difficult - sheep best results fresh and frozen semen Fresh Semen Programs GOOD BAD Potential for best results Simple insemination techniques Same-day AI Restricts distances Requires high numbers of sperm cells Ram performance affects Semen quality .

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