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Effect of Embryo Factors on Pregnancy and Abortion Rate after Transfer of In Vitro Produced Korean Native Cattle Embryos  

Park Y. S. (Kyongbuk Livestock Research Institute)
Kim S. S. (College of Veterinary Medicine, Chungbuk National University)
Park H. D. (Division of Life Food and Biotech, Daegu University)
Park H. J. (College of Veterinary Medicine, Cheju National University)
Kim J. M. (College of Medicine, Pochon Cha University)
Publication Information
Journal of Embryo Transfer / v.20, no.2, 2005 , pp. 89-95 More about this Journal
Abstract
In this study, we investigated the effects of number, grade, stage and day of embryos on pregnancy and abortion rates of Holstein heifer recipients after transfer of in-vitro produced Korean Native Cattle (Hanwoo) embryos. When one, two or three blastocysts were transferred to recipients, pregnancy (32.0, 44.0 and $32.0\%$) and abortion (12.5, 13.6 and $6.3\%$) rates did not differ among treatments. The pregnancy and abortion rates of different grades of blastocysts were $40.8\~44.2\%\;and\;9.4\~16.3\%$, respectively. However, they were not significantly different. According to the stage of blastocyst, the pregnancy rates were similar between $39.1\%\;and\;45.3\%$. However, the abortion rate in hatched blastocyst stage $(20.8\%)$ was significantly higher than that in late blastocyst stage $(9.0\%)$. The pregnancy rates in day $7\cdot7$ and day $7\cdot8$ blastocyst (47.1 and $53.9\%$, respectively) was significantly higher than that in the day $9\cdot9\;and\;8\cdot9$ blastocyst (29.8 and $27.7\%$, respectively). The abortion rate was the highest in the day $9\cdot9$ blastocyst $(30.8\%)$ among treatments, and it was significantly different compared to that in the day $7\cdot7$ blastocyst $(10.1\%)$. Therefore, this study suggested that the pregnancy rate was affected by only day of embryos, while the abortion rate was affected by stage and day of embryos.
Keywords
bovine; in vitro; embryo transfer; pregnancy; abortion;
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