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Fertilizability of oocytes derived from Holstein cows having different antral follicle counts in ovaries

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タイトル: Fertilizability of oocytes derived from Holstein cows having different antral follicle counts in ovaries
著者: Nagai, Katsuhisa 著作を一覧する
Yanagawa, Yojiro 著作を一覧する
Katagiri, Seiji 著作を一覧する
Nagano, Masashi 著作を一覧する
キーワード: Dairy cattle
Ovarian reserve
Antral follicle count
Ovum pick-up
Oocyte quality
発行日: 2015年12月
出版者: Elsevier
誌名: Animal Reproduction Science
巻: 163
開始ページ: 172
終了ページ: 178
出版社 DOI: 10.1016/j.anireprosci.2015.11.009
抄録: In this study, to clarify the relationship between ovarian reserve and oocyte quality, cumulus-oocyte complexes (COCs) were collected repeatedly by ovum pick-up (OPU) from cows with high and low antral follicle counts (AFCs) at short (3–4 days) and long (7 days) intervals, and COC morphologies and oocyte fertilizability were examined. The relationship between AFC and follicular growth after OPU was also investigated. Cows showing AFC of ≥30 in at least one OPU session were grouped into the high-AFC group. At a short interval, follicular sizes and COC morphologies were similar between the different AFC groups. However, the normal fertilization rate was higher in the high-AFC group than in the low one, although total penetration rates were similar. At a long interval, the percentage of COCs with poor morphology in the high-AFC group was higher and the normal fertilization rate was lower than in the low one. In the low-AFC group, normal fertilization rates at short and long intervals were similar, and mean follicular size became larger at a long than at a short interval. However, mean follicular sizes at short- and long-interval OPU were similar in the high-AFC group. In conclusion, it is suggested that oocytes derived from cows with high AFC had higher fertilizability than those from cows with low AFC when OPUs were performed at a short (3–4 days) interval. However, oocyte quality in high-AFC cows was impaired by long-interval (7 days) OPU, possibly due to the degradation of follicles.
Rights: ©2015, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/63729
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 永野 昌志

 

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