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KMID : 1005220080230040291
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Journal of Embryo Transfer
2008 Volume.23 No. 4 p.291 ~ p.298
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Developmental Competence of Oocytes Collected from Individual Ovaries of Slaughtered Korean Native Cattle with Grade of Meat Quality and Meat Yield
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Kim So-Seob
Park Yong-Su
Kim Jae-Young
Park Min-Chul
Kim Jae-Myeoung
Kim Ji-Sun
Park Hum-Dae
Lee Su-Kap
Kim Yun-Sik
Lee Jung-Hyung
Oh Dae-Sik
Park Il-Kun
Lee Dong-Won
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Abstract
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We separately cultured follicular oocytes collected from individual ovaries of slaughtered Korean native cows and examined both the embryonic development rate and pregnancy rate after embryo transplantation according to the meat yield and quality grades of the source beef carcass. Oocytes from meat yield grade B cows exhibited a higher fertilization rate and embryonic developmental rate to the eight-cell stage than oocytes from grade A or C animals (p<0.05), but there was no significant difference in rate of development to the blastocyst stage among meat yield grades A, Band C. The oocyte cleavage rate and development rate to the eight-cell stage from meat quality grade 3 cattle was higher than grades 1++, 1+, 1 and 2 (p<0.05). Embryos derived from grade animals displayed a development rate to the blastocyst stage of 19.4%, which was also higher than all other meat quality grades (p<0.05). Transplantation of in vitro-cultured oocytes from meat yield grade A ovaries led to a higher pregnancy rate (64.2%) than in vitro-cultured oocytes from meat yield grade B ovaries (56.5%), but there was no significant difference between the two groups in pregnancy or abortion rates. In conclusion, embryonic development rate and pregnancy rate has a close relation to meat quality grades of the source beef carcass, this results is to give information for the Korean native cows improvement of breed.
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KEYWORD
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bovine embryo, meat quality, meat yield, carcass grade, individual ovary collection
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