Comparison of Plasma Concentrations of Estradiol-17β and Progesterone, and Conception in Dairy Cows with Cystic Ovarian Diseases between Ovsynch and Ovsynch plus CIDR Timed AI Protocols
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概要
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The objectives of this study were 1) to determine the effects of adding a CIDR to the Ovsynch protocol on plasma concentrations of estradiol-17β and progesterone and conception in dairy cows with cystic ovarian diseases and 2) to examine associations among the estradiol-17β and progesterone concentrations and conception. Cows were diagnosed as having cystic ovarian diseases if they were found to have a cystic follicle (diameter ≥25 mm) without a corpus luteum by two palpations per rectum with an interval for 7 to 14 days. They were treated with either the Ovsynch (GnRH on Day 0, PGF2α on Day 7 and GnRH on Day 9, with AI on Day 10; n=15) or Ovsynch+CIDR protocol (Ovsynch protocol plus a CIDR from Day 0 to Day 7; n=23). Plasma estradiol-17β concentrations were determined on Days 0, 7 and 9, and plasma progesterone concentrations were determined on Days 0, 7, 9 and 17. The plasma estradiol-17β and progesterone concentrations at all of the days examined and conception rates did not differ significantly between the two timed AI protocols. The progesterone concentrations on Day 17 and conception rates were lower (P<0.05) for cows with low concentrations of estradiol-17β (<2 pg/ml) on Day 9 than for cows with high concentrations of estradiol-17β (≥2 pg/ml). The present study suggests that, in dairy cows with cystic ovarian diseases, addition of a CIDR to the Ovsynch protocol had no remarkable effects on plasma estradiol-17β and progesterone concentrations during and after the treatments or on conception after timed AI. This study indicates that the low plasma estradiol-17β concentration at the second administration of GnRH in the protocols can be a predictor for impaired luteal formation and lower likelihood of pregnancy in dairy cows with cystic ovarian diseases.
- 2011-04-01
著者
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KAWATE Noritoshi
Department of Advanced Pathobiology, Graduate School of Life and Environmental Sciences, Osaka Prefe
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TAMADA Hiromichi
Department of Advanced Pathobiology, Graduate School of Life and Environmental Sciences, Osaka Prefe
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Imai Taku
東京女子医科大学 循環器内科
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UENAKA Kazuhiro
Southern Chief Veterinary Clinical Center, Kyoto Prefectural Federation of Agricultural Mutual Aid A
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TAKAHASHI Masahiro
Department of Advanced Pathobiology, Graduate School of Life and Environmental Sciences, Osaka Prefe
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Inaba Toshio
Department Of Advanced Pathobiology Graduate School Of Life And Environmental Sciences Osaka Prefect
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Inaba Toshio
Department Of Animal Reproduction College Of Agriculture Osaka Prefecture University
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Watanabe Kensuke
Department Of Advanced Pathobiology Graduate School Of Life And Environmental Sciences Osaka Prefect
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Tamada H
Department Of Advanced Pathobiology Graduate School Of Life And Environmental Sciences Osaka Prefect
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Kawate N
Department Of Advanced Pathobiology Graduate School Of Life And Environmental Sciences Osaka Prefect
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Uenaka Kazuhiro
Southern Chief Veterinary Clinical Center Kyoto Prefectural Federation Of Agricultural Mutual Aid As
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Tamada Hiromichi
Department Of Advanced Pathobiology Graduate School Of Life And Environmental Sciences Osaka Prefecture University
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Takahashi Masahiro
Department Of Advanced Pathobiology Graduate School Of Life And Environmental Sciences Osaka Prefecture University
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KAWATE Noritoshi
Department of Advanced Pathobiology, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1–58 Rinku-oraikita, Izumisano, Osaka 598–8531, Japan
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