Lambing Rates by Fixed-Time Intrauterine Insemination with Frozen Semen in Seasonally Anestrous Ewes Treated with a Progestogen-Impregnated Sponge or CIDR<SUP>®</SUP> Device
スポンサーリンク
概要
- 論文の詳細を見る
During the non-breeding season (April to July), 187 ewes treated wth either an intravaginal sponge impregnated with medroxyprogesterone acetate (MAP) or a controlled internal drug release (CIDR<SUP>®</SUP>) device for 9 days and an injection of pregnant mare serum gonadotropin (PMSG) at one day before the cessation of progestogen treatment were inseminated into the uterus by laparoscopy with frozen-thawed semen at fixed-time basis (36, 48 or 60h after the removal of sponge or device). Insemination was also performed at 18 h after estrus detection as a control. The time to the onset of estrus after CIDR<SUP>®</SUP> treatment was significantly (P<0.05) earlier (mean: 24.9h) than that in ewes treated with MAP sponge (mean: 30.0h). The percentages of ewes lambing and lambs born per ewe lambing for inseminations at 36, 48 and 60 h were 66.7% and 1.69; 52.0% and 1.31; 46.2% and 1.75 for MAP-treated ewes, and 33.3% and 1.50; 73.9% and 1.53; 40.9% and 1.56 for CIDR<SUP>®</SUP>-treated ewes. For control ewes, they were 59.1% and 1.62; and 47.6% and 1.90 for MAP and CIDR<SUP>®</SUP> treatments, respectively. There was no significant differences in the lambing rates and prolificacy between MAP and CIDR<SUP>®</SUP> treatments and among the insemination times. An optimum time for an intrauterine insemination with frozen-thawed semen appears to be different in the use of MAP sponge (range: 36 to 60h) and CIDR<SUP>®</SUP> (48h). A significant difference in the lambing rate was found among the sheep farms conducting the present study.
- 日本繁殖生物学会の論文
著者
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Fukui Yutaka
Laboratory Of Animal Genefics And Reproduction Obihiro University Of Agriculture And Veterinary Medi
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HIRAI Hidekuni
Laboratory of Animal Genetics and Reproduction, Obihiro University of Agriculture and Veterinary Med
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HONDA Koji
Laboratory of Animal Genetics and Reproduction, Obihiro University of Agriculture and Veterinary Med
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HAYASHI Kenichi
Laboratory of Animal Genetics and Reproduction, Obihiro University of Agriculture and Veterinary Med
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HONDA Koji
Laboratory of Animal Genetics and Reproduction, Obihiro University of Agriculture and Veterinary Medicine
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HIRAI Hidekuni
Laboratory of Animal Genetics and Reproduction, Obihiro University of Agriculture and Veterinary Medicine
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