Resumption of Ovarian Cyclicity after Superovulation Treatment to Donor Cow in Hanwoo
2010
Son, J.K., Animal Genetic Resources Station, National Institute of Animal Science, RDA, Namwon, Republic of Korea | Choe, C.Y., Animal Genetic Resources Station, National Institute of Animal Science, RDA, Namwon, Republic of Korea | Cho, S.R., Animal Genetic Resources Station, National Institute of Animal Science, RDA, Namwon, Republic of Korea | Yeon, S.H., Animal Genetic Resources Station, National Institute of Animal Science, RDA, Namwon, Republic of Korea | Choi, S.H., Animal Genetic Resources Station, National Institute of Animal Science, RDA, Namwon, Republic of Korea | Kim, N.T., Animal Genetic Resources Station, National Institute of Animal Science, RDA, Namwon, Republic of Korea | Jung, J.W., Animal Genetic Resources Station, National Institute of Animal Science, RDA, Namwon, Republic of Korea | Kim, S.J., Animal Genetic Resources Station, National Institute of Animal Science, RDA, Namwon, Republic of Korea | Jung, Y.S., Animal Genetic Resources Station, National Institute of Animal Science, RDA, Namwon, Republic of Korea | Bok, N.H., Animal Genetic Resources Station, National Institute of Animal Science, RDA, Namwon, Republic of Korea | You, Y.H., Animal Genetic Resources Station, National Institute of Animal Science, RDA, Namwon, Republic of Korea | Son, D.S., National Institute of Animal Science, RDA, Suwon, Republic of Korea
The objective of this study was to investigate the effects of abnormal ovarian cycles after superovulation treatment of Hanwoo donors. Thirty six, at random stages of the estrous cycle, received a CIDR. Four days later, the animals were superovulated with a total of 28AU FSH (Antorin, 2AU=1 ml) administered twice daily in constant doses over 4 days. On the 3th administration of FSH, CIDR was withdrawn and 25 mg PGF₂α was administered. Cows were artificially inseminated twice after estrous detection at 12 hr intervals. The cows received 100μg GnRH at the time of 1nd insemination. Embryos were recovered 7 or 8 days after the 1st insemination. The cows were considered to have resumed ovarian cyclicity on the day of ovulation if followed by regular ovarian cycles. 50.0 percentage of the cows (18/36) had normal resumption of ovarian cyclicity (resumption within 40 days after superovulation), and 50.0% (18/36) had delayed resumption(resumption did not occur until greater than 40 days after superovulation). Delayed resumption Type Ⅱ(first ovulation did not occur until greater-than or equal to 40 days after superovulation, i.e. delayed first ovulation 33.3%) were the most common types of delayed resumptions. The mean numbers of total ova from less than 10 and 10 less-than or equal to of corpora lutea (CL) was 7.3 and 13.9, respectively. The number of transferable embryos differed between less than 10 and 10 less-than or equal to CL was 4.2 and 5.1, respectively. 11.1 percentage of the cows (4/36) did not resumption their ovarian cyclicity until 60 days after superovulation treatment.
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