A Three-day PGF₂α Plus eCG-based Fixed-time AI Protocol Improves Fertility Compared with Spontaneous Estrus in Dairy Cows with Silent Ovulation
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- GARCIA-ISPIERTO Irina
- Department of Animal Production, University of Lleida, 25198 Lleida, Spain
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- LÓPEZ-GATIUS Fernando
- Department of Animal Production, University of Lleida, 25198 Lleida, Spain
書誌事項
- タイトル別名
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- A Three-day PGF<sub>2α</sub> Plus eCG-based Fixed-time AI Protocol Improves Fertility Compared with Spontaneous Estrus in Dairy Cows with Silent Ovulation
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This study was designed to test the treatment with prostaglandin F2α (PGF2α) plus equine chorionic gonadotrophin (eCG) and GnRH 48 h later (PEG protocol) followed by fixed-time AI (FTAI) in dairy cows with silent ovulation (cows with a mature corpus luteum and no signs of estrus detected in the preceding 21 days). In Experiment I, ovulation following the PEG protocol monitored in 24 cows with silent ovulation was recorded in 83% of the cows 36 h after GnRH treatment. In Experiment II, control cows were artificially inseminated during spontaneous estrus (4615 AI), while cows in the PEG group (1266 AI) were subjected to FTAI 24 h after GnRH treatment. Binary logistic regression revealed a significant effect of the interactions of treatment by season, by parity or by repeat breeding syndrome (>3 AI) on the conception rate. The conception rate was negatively affected by the warm season and age in controls but not in treated cows, whereas repeat breeder cows in the control and PEG groups were less (by a factor of 0.7) or more (by a factor of 1.5) likely to become pregnant, respectively, than the remaining animals. Moreover, the likelihood of twin pregnancy was lower in multiparous PEG (by a factor of 0.4) cows than in the remaining cows. This protocol, besides overcoming the negative effects of heat stress and age on the conception rate, increased fertility in repeat breeder cows compared with spontaneous estrus. Moreover, this treatment regimen reduced the twin pregnancy rate in multiparous cows.
収録刊行物
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- Journal of Reproduction and Development
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Journal of Reproduction and Development 59 (4), 393-397, 2013
公益社団法人 日本繁殖生物学会
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詳細情報 詳細情報について
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- CRID
- 1390001206335823488
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- NII論文ID
- 10031195877
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- NII書誌ID
- AA10936678
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- COI
- 1:STN:280:DC%2BC3snmtVOmsw%3D%3D
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- ISSN
- 13484400
- 09168818
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- NDL書誌ID
- 024797955
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- PubMed
- 23698789
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可