Effect of Suckling on Embryo Production by Repeated Ovum Pick-Up Before and After Timed Artificial Insemination in Early Postpartum Japanese Black Cows
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概要
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We investigated whether suckling would affect embryo production of cows bred by timed artificial insemination (TAI) following an ovulation synchronization protocol combined with ovum pick-up and progesterone releasing intravaginal device (OPU-PRID-TAI protocol). The number of oocytes and transferable embryos collected by repeated OPU, performed before and after TAI, were recorded. A total of 14 Japanese Black cows were divided into weaned (n=7) and suckled groups (n=7). All 14 cows were treated with OPU on day 0 (the first day of treatment) and then with a PRID for 9 days. Prostaglandin F2α analog was administered on day 7, GnRH analog was administered on day 10 (36 h after removal of the PRID) and TAI was performed 12 h later. Ovulation was confirmed by palpation per rectum the following day. After TAI, additional OPU sessions were performed on days 18, 25 and 32. The synchronized ovulation rates of the weaned and suckled groups were 100 and 85.7%, and the conception rates were 71.4 and 42.9%, respectively. Immature oocytes were fertilized and cultured in vitro. The numbers of oocytes collected and blastocysts generated were similar between the individual OPU sessions in both groups. However, the total numbers of oocytes collected, cultured oocytes, cleavage embryos and blastocysts as well as the proportions of cleavage embryos and blastocysts to cultured oocytes were all significantly (P<0.05) greater in the weaned group compared with the suckled group. These results suggest that the OPU-PRID-TAI protocol has the potential to produce a significant number of good-quality embryos in vitro after repeated OPU in early postpartum weaned Japanese Black cows. To collect more oocytes and produce more embryos, we suggest that calves be removed from cows scheduled for treatment using this protocol.
- 2008-10-01
著者
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大澤 健司
岩手大学農学部
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Sasaki Osamu
Department of Cardiology, Saitama Medical Center, Saitama Medical University
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大澤 健司
岐阜大学大学院連合獣医学研究科
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大澤 健司
岩手大学 農学部
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Sasaki Osamu
Department Of Veterinary Medicine Faculty Of Agriculture Iwate University
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大澤 健司
岩手大学農学部 獣医学科
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Osawa T
Laboratory Of Theriogenology Faculty Of Agriculture Iwate University
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Osawa Takeshi
Laboratory Of Theriogenology Department Of Veterinary Medicine Faculty Of Agriculture Iwate Universi
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Osawa Takeshi
Department Of Veterinary Medicine Faculty Of Agriculture Iwate University
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Hirata Toh-ichi
Department Of Veterinary Medicine Faculty Of Agriculture Iwate University
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Sato Mai
Department Of Applied Biological Science Faculty Of Agriculture Tokyo University Of Agriculture And
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SASAKI Shu-Ichi
Department of Veterinary Medicine, Faculty of Agriculture, Iwate University
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Sasaki Shu-ichi
Department Of Veterinary Medicine Faculty Of Agriculture Iwate University
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Sato Mai
Department Of Veterinary Medicine Faculty Of Agriculture Iwate University
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Osawa Takeshi
岩手大学 農学部獣医学科獣医臨床繁殖学
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Sasaki Osamu
Department Of Cardiology Uwajima Social Insurance Hospital
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Osawa Takeshi
Department Of Anesthesiology And Intensive Care Medicine Graduate School Of Medical Science Kanazawa University
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