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KMID : 1005219880030010038
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Journal of Embryo Transfer
1988 Volume.3 No. 1 p.38 ~ p.42
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Studies on Repeated Superovulation and Frozen-Thawed Embryo Transfer in Korean Native Cattle
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양보석
오성종/유승환/김희석/정연후/이근상
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Abstract
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These studies were conducted to investigate the effect of repreated superovulation on embryo production, the effect of the frozen-thawed embryos transferred on the developmental stage and grade, and donor-recipient synchrony on pregnancy rate in Korean native cattle. The results obtained in these studies were as follows: 1. Repeated superovulations in Korean Native Catile were not affected on the number of corpus luteum (CL), embryos recovered and embryos cleaved (range: 4.8 ± 4.21 to 9.5 ± 6.50, 1.8 ± 2.53 to 8.2 ± 8.04 and 1.6 ± 2.32 to 4.0 ± 4.59, respectively). 2. Blastocyst embryos (38.5%) showed higher pregnancy rate than morula (31.6%). 3. The pregnancyrates of cattle transferred with good and fair embryos were 33.3% and 40.4%, respectively. 4. The pregnancy rate when the donors exhibited estrus 12 hours earlier than the recipients (62.5%) was higher than when the donors and recipients exhibited estrus at the same time (33.3%) or when the donors exhibited estrus 12 hours later than the recipients (20.0%).
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KEYWORD
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