非繁殖季節のめん羊における異なる3種の発情・排卵誘起法の比較
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概要
- 論文の詳細を見る
The aim of the present study was to compare three methods of estrus synchronization in ewes during the non-breeding season. Forty-two ewes were randomly grouped for three treatments with different intravaginal devices for 12 days: Group A) CIDR, Group B) Self-made P sponge, Group C) MAP (medroxyprogesterone acetate) cream sponge. Furthermore, all groups were divided into two treatments with (R) or without ram presence to examine the "ram effect". Blood was collected from all treated ewes, and progesterone (P4), estradiol 17-β (E2) and luteinizing hormone (LH) concentrations were measured by enzyme-immnoassay. All ewes showed estrus behavior between Day 0 to 3 after device removal, and the mean onset times of their estrus were 23.0, 33.0 and 21.0 h for Groups AR, BR and CR, respectively. On Day 5 as examined by laparoscopy, the ovulation rates (and number of ovulated ewes) were 1.45 (11/11), 1.25 (12/14) and 1.21 (14/14) for Groups A, B and C, respectively. In Group C, the time to LH surge was significantly (P<0.05) later (32.4 h) than those in Groups A (27.0 h) and B (25.5 h). Ram presence did not affect the number of ovulated ewes, ovulation rate or time to LH surge. The ram introduction group had significantly (P<0.05) lower E2 concentrations during the period from 0 h to 36 h than the groups without ram presence. These results suggest that the self-made P sponge or MAP cream sponge was effective as well as CIDR, and ram introduction was not necessary, for induction of estrus and ovulation during the non-breeding season.
- 日本繁殖生物学会の論文
著者
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小林 直
帯広畜産大学・畜産科学科・家畜増殖学研究室
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FUKUI Yutaka
Laboratory of Animal Reproduction, Obihiro University of Agriculture and Veterinary Medicine
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KOHNO Hirohide
National Livestock Breeding Center, Tokachi Station
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Iida Kenji
Laboratory Of Biochemistry Department Of Agricultural Chemistry Kyoto University
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Fukui Yutaka
Laboratory Of Animal Reproduction Obihiro University Of Agriculture And Veterinary Medicine
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Kohno Hirohide
National Livestock Breeding Center Tokachi Station
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MIYAMOTO AKIO
Laboratory of Animal Genetics and Reproduction, Department of Animal Science, Obihiro University of
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飯田 憲司
Laboratory of Animal Reproduction, Department of Animal Production Science, Obihiro University of Ag
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小林 直
Laboratory of Animal Reproduction, Department of Animal Production Science, Obihiro University of Ag
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河野 博英
National Livestock Breeding Center, Tokachi Station
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KOBAYASHI Nao
Laboratory of Animal Reproduction, Department of Animal Production Science, Obihiro University of Ag
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Miyamoto Akio
Laboratory Of Animal Genefics And Reproduction Obihiro University Of Agriculture And Veterinary Medi
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Fukui Yutaka
Laboratory Of Animal Genefics And Reproduction Obihiro University Of Agriculture And Veterinary Medi
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FUKUI Yutaka
Laboratory of Animal Reproduction, Department of Animal Production Science, Obihiro University of Agriculture and Veterinary Medicine
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KOBAYASHI Nao
Laboratory of Animal Reproduction, Department of Animal Production Science, Obihiro University of Agriculture and Veterinary Medicine
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