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KMID : 0900920000240010083
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Korean journal of Animal Reproduction
2000 Volume.24 No. 1 p.83 ~ p.88
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Studies on the Ultrasound-guided Transvaginal Retrieval of Oocytes in Korean Native, Hanwoo Heifers II. Effects of Repeated Ovum Pick-up on Oocyte Recovery and Estrous Cycle
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Yang B.-S.
Seong Hwan-Hoo
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Abstract
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This study was conducted to determine the effect of repeated ultrasound-guided transvaginal retrieval of oocytes recovery, estrous cycle and ovarian adhesion in Korean native, Hanwoo heifers. Heifers were at unknown stages of the estrous cycle at the start of experiments in which all follicles geq6mm in diameter were ablated. The results obtained in this study were as follows; Follicle developing number and oocytes collected number were no effected to repeated OPU to nine session, 4 e.a range oocytes collected to repeated OPU session. Oocytes were observated follicles were 8.7pm4.2 e.a, collected oocytes were 4.1pm3.4 e.a to two times collected per week and observated follicles was 10.2pm6.1 e.a, collected oocytes were 4.3pm2.9 e.a to one times collected per week, but no difference significantly(P＜0.05). Ovaries adhesive percentage to repeated OPU was eight ovaries adhisived(20%) of forty ovaries, three ovaries(7.5%) to 1~3 times oocytes collected, four ovaries(l0%) to 4~6 times, one ovaries(2.5%) to 7~9 times oocytes collected session. To repeated OPU effection, ovaries adhisive heifers were long estrous cycle(＞25 day) to 7 heads(87.5%) of 8 head, non-adhesive ovaries heifers were 5 heads(41.7%) were long estrous cycle to repeated OPU 12 heads. Although, now unknown about the dynamics of follicles wave and about functional changes to repeated OPU ovaries, more question about ovaries adhesive cause remain.
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KEYWORD
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Ultrasound-guided, Hanwoo heifer, OPU, Follicular wave
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