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KMID : 1005220110260010033
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Journal of Embryo Transfer
2011 Volume.26 No. 1 p.33 ~ p.36
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Effects of Corpus Luteum Grade of Estrus Synchronized Recipients on Pregnancy Rate following Embryo Transfer in Korean Cattle
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Choe Chang-Yong
Son Jun-Kyu
Cho Sang-Rae
Kang Da-Won
Yeon Seong-Heum
Choi Sun-Ho
Kim Nam-Tae
Jung Yeon-Sub
Kim Sung-Jae
Jung Jin-Woo
Bok Nan-Hee
Choi Jin-Seok
Son Dong-Soo
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Abstract
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The objective of this work was to determine the effect of corpus luteum (CL) grade on pregnancy rate after embryo transfer in Korean cattle and we found that CL development was linked to pregnancy rate. The in vivo derived blastocyst-stage embryos were transferred to 15 recipients synchronized in the estrus cycles. Based on size and palpable characteristics, CLs were categorized into three grade. The grade three CL is not to be identified by rectal palpation. The pregnancy rates tended to increase with the increase in CL size of recipients. In grade one, two, and three, the pregnancy rates were 62.5%, 50.0%, and 0%, respectively. This result suggests that pregnancy rates after embryo transfer might be affected by the CL status of recipients.
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KEYWORD
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pregnancy rate, embryo transfer, corpus luteum, Korean cattle
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