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Effect of Collective Methods on the Collection Efficiency, Blastocyst and Pregnancy Rate after IVP Embryo Transfer in Hanwoo  

Lee J. W. (Department of Animal Science and Technology, College of Agriculture and Life Science, Sunchon National University)
Jung S. Y. (Department of Animal Science and Technology, College of Agriculture and Life Science, Sunchon National University)
Son B. H. (Department of Animal Science and Technology, College of Agriculture and Life Science, Sunchon National University)
Han K. H. (Hanil Animal Hospital)
Oh I. S. (Animal Breeding Service in Korea)
Seo H. J. (Department of Animal Science and Technology, College of Agriculture and Life Science, Sunchon National University)
Kong I. K. (Department of Animal Science and Technology, College of Agriculture and Life Science, Sunchon National University)
Publication Information
Journal of Embryo Transfer / v.20, no.1, 2005 , pp. 55-62 More about this Journal
Abstract
This study was undertaken to access the effect of collection methods on the collection efficiency, blastocyst rate and pregnancy rate after IVP embryo transfer. The ovaries of Hanwoo were obtained from an abattoir and kept on 25 to $28^{\circ}C$ and transported to laboratory within 4 hrs. The oocytes were collected by aspiration of follicles $(2\~6\;mm)$ with or without slicing of ovaries after aspiration. The oocytes were matured in vitro (IVM) for 20 to 24 hrs in TCM-199 supplemented with $10\%$ fetal bovine serum at $39^{\circ}C$ under $5\%\;CO_{2}$ in air. Following routine IVM/IVF procedure, the oocytes and presumed zygotes were cultured for three day in CRlaa medium with BSA. The cumulus cells at 2 to 8-cell stage of embryos removed then the embryos and were cultured in CRlaa medium containing $10\%$ fetal bovine serum in $5\%\;CO_{2}$ at $39^{\circ}C$. The fresh blastocysts cultured for 7 to 9 days were transferred into recipients. The numbers of oocytes recovered form two different methods, the aspiration and slicing after aspiration, were compared to know what. The number of oocytes per ovary was 8.2 and 6.5 in aspiration combining slicing, and aspiration groups, respectively (p<0.05). The cleavage rate in aspiration method are significantly (p<0.05) high than those in slicing post aspiration $(27.9\%)$, and aspiration $(25.5\%)$. The pregnancy .ate in aspiration method $(62.5\%)$ was high than that in slicing method after aspiration $(54.4\%)$. The pregnancy rates of aspiration method and slicing method after aspiration in nullipara $(58.1\%\;vs\;68.2\%)$ was high than that in pluripara $(49.5\%\;vs\;53.2\%)$. The results obtained that the increased number of oocytes per ovary in slicing method after aspiration could be better than that in aspiration method. Pregnancy rate in aspiration method was slightly higher in than that in slicing method after aspiration.
Keywords
aspiration; slicing; in vitro development; embryo transfer;
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