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미성숙 및 성숙미경산우의 다배란 처리가 난소반응 , 수정란 생산과 수태에 미치는 영향
김종국(J . G . Kim),정구민(K . M . Chung),임경순(K . S . Im),이용빈(Y . B . Lee) 한국축산학회 1988 한국축산학회지 Vol.30 No.5
This experiment was carried out to investigate the effects of superovulation on the ovarian response and non-surgical recovery in immature and mature heifers. The possibility of nonsurgical recovery from the immature heifers and pragnancy of embryos transferred to mature recipients was also investigated. Total 8 heifers (S heads of Holstein, 2 heads Korean Native Cattle (KNC) and 1 head of Angus × Hereford crossbred) were devided into 2 groups by their age. Immature heifers (Group I) were 7-10 months old and mature heifers (Group II) were 12-18 months old. Heifers of Group I and Group II were superovulated with muscular injection of 1,000 or 2,000 IU Pregnant Mare`s Serum Gonadotropin (PMSG) on day 10-12 of estrous cycle followed by muscular injection of 25㎎ PGF₂α 48h later. Heifers were artifically inseminated or copulated 2 to 3 times with the interval of 12h while they were in heat. The embryos were collected non-surgically on day 6 of estrous cycle. The results obtained from this study were summarized as follows: 1. The average number of corpus lutea (CL) by the superovulation treatment was much greater in Group II (9.2) than in Group I (3.2). 2. The average number of unruptured follicles by superovulation treatment was much grater in Group II (6.8) than Group I (1.0). 3. The interval to onset estrus after PGF₂α injection was longer in Group I (44.2) than in Group II (31.8h). 4. There was no difference in the duration of estrus between Group I (32.0h) and Group II (37.5h). 5. It was possible to flush the uterus of 7 month old KNC heifers non-surgically. 6. The average number of embryos recovered was much greater in Group II (6.0) than in Group I (2.3) and the recovery rate of embryos in Group I (73.6%) was similar to that Group II (87.3%). More flushing fluid was recovered in Group I (93.0%) than in Group II (87.3%). 7. Twelve of 14 embryos recovered (87.5%) were normal in Group I, while 17 of 54 embryos (31.5%) were normal in Group II. 8. All of the normal embryos (12/12) were morula in Group I, while 82.4% (14/17) of the normal embryos were monala and 17.6%o (3/17) were blastocysts in Gooup II. 9. The estrous cycle after superovulation treatment tended to become longer with the average of 24.8 days in Group I and 24 days in Group II. Some donor heifers had cystic ovaries. 10. Six embryos were transferred to 4 recipients non-surgically. One recipient who had received 2 morula that were recovered from a 10 month old KNC-2 became pregnant and delivered a male Korean native calf of 27 Kg.