KMID : 0359319890290030361
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Korean Journal of Veterinary Research 1989 Volume.29 No. 3 p.361 ~ p.371
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Effects of stage and quality of embryo , synchrony between donor and recipient and difficulty of transfer on pregnancy rate following non - surgical transfer of frozen - thawed bovine embryos
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Abstract
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This study was performed to investigate the effects of stage and quality of embryo, synchrony between donor and recipient and difficulty of transfer on pregnancy rate following non-surgical transfer of frozen-thawed bovine embryos.
The results were as follows;
1. The overall pregnancy rate of this experiment was 63.4% and that of heifers(73.1%) was higher than that of cows(46.7%).
2. The pregnancy rates of recipients transferred with morulae, early blastocysts and blastocysts were 50.0%, 64.7% and 71.4%, respectively.
3. The pregnancy rate of recipients transferred with good embryos(67.9%) was higher than that of recipients transferred with fair embryos(53.8%).
4. The pregnancy rates of embryos transferred to left and right uterine horn were 63.2% and 63.6%, respectively.
5. The pregnancy rate of recipients in estrous synchrony 0(76.2%) was higher than those of recipients in synchrony £1(55.6%) and £«1(44.4%).
6. The pregnancy rate of recipients transferred with 2 embryos(71.4%) was higher than that of recipients transferred with 1 embryo(61.8%).
7. The pregnancy rate of embryos transferred to uterine tip (72.0%) was higher than that of embryos transferred to uterine base(50.0%).
8. Ease of transfer was ranked to a scale of one to three on the basis of increasing difficulty. Transfers ranked as ease score 1 accounted for 77.8% of pregnancies and had higher pregnancy rate than ease score 2(66.7%) or 3(45.5%).
9. The pregnancy rate of recipients with excellent corpus luteum(CL) (70.0%) was higher than those of recipients with good CL(61.1%) or fair CL(61.5%).
In reviewing above results, it was considered that the factors such as embryo stage, embryo quality, estrous synchrony, corpus luteum quality, transfer site within uterus, recipient¢¥s parity and ease score affected the pregnancy rate after non-surgical transfer of frozen-thawed bovine embryos.
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