Effect of Insertion Periods of Controlled Internal Drug Release Device (CIDR<SUP>R</SUP>) on Conception Rate by Fixed-Time Intrauterine Insemination with Frozen Semen in Seasonally Anestrous Ewes
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概要
- 論文の詳細を見る
Conception rates and plasma hormonal patterns were investigated after treating ewes with CIDR<SUP>R</SUP> (controlled internal drug release device) for different lengths of time during the non-breeding season. In Experiment 1, 101 Suffolk ewes were treated with CIDR<SUP>R</SUP> for 6, 9, 12 days; pregnant mares serum gonadotropin (PMSG) was injected the day before CIDR<SUP>R</SUP> removal. At 42 to 50 h after treatment, ewes were inseminated with frozen-thawed semen using a laparoscope. Lambing rates were not significantly different among the groups (66.7, 76.5 and 85.3% for 6, 9, and 12 days, respectively). Seven days after insemination, the re-insertion of CIDR<SUP>R</SUP> for 14 days (n=51) did not improve the pregnancy and lambing rates or prolificacy compared to the controls (n=50). In Experiment 2, the mean plasma progesterone concentration on the day of CIDR<SUP>R</SUP> removal in Booroola-Dorset ewes treated for 12 days was significantly (P<0.01) lower than those in ewes treated with CIDR<SUP>R</SUP> for 6 or 9 days. However, the onset of estrus after treatment was similar in ewes treated for different periods with CIDR<SUP>R</SUP>. These results indicate that a satisfactory lambing rate (67 to 85%) can be obtained with frozen semen in ewes treated with CIDR<SUP>R</SUP>, regardless of the insertion period (6 to 12 days) during the non-breeding season.
- 日本繁殖生物学会の論文
著者
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FUKUI Yutaka
Laboratory of Animal Reproduction, Obihiro University of Agriculture and Veterinary Medicine
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Fukui Yutaka
Laboratory Of Animal Reproduction Obihiro University Of Agriculture And Veterinary Medicine
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Yamada Aki
Laboratory Of Animal Genetics And Reproduction Obihiro University Of Agriculture And Veterinary Medi
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TABUCHI Kojiro
Laboratory of Animal Genetics and Reproduction, Obihiro University of Agriculture and Veterinary Med
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HAYASHI Noriko
Laboratory of Animal Genetics and Reproduction, Obihiro University of Agriculture and Veterinary Med
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TANAKA Kumiko
Laboratory of Animal Genetics and Reproduction, Obihiro University of Agriculture and Veterinary Med
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Fukui Yutaka
Laboratory Of Animal Genefics And Reproduction Obihiro University Of Agriculture And Veterinary Medi
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HAYASHI Noriko
Laboratory of Animal Genetics and Reproduction, Obihiro University of Agriculture and Veterinary Medicine
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TANAKA Kumiko
Laboratory of Animal Genetics and Reproduction, Obihiro University of Agriculture and Veterinary Medicine
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TABUCHI Kojiro
Laboratory of Animal Genetics and Reproduction, Obihiro University of Agriculture and Veterinary Medicine
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