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

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Title: Fertilizability of oocytes derived from Holstein cows having different antral follicle counts in ovaries
Authors: Nagai, Katsuhisa Browse this author
Yanagawa, Yojiro Browse this author
Katagiri, Seiji Browse this author →KAKEN DB
Nagano, Masashi Browse this author →KAKEN DB
Keywords: Dairy cattle
Ovarian reserve
Antral follicle count
Ovum pick-up
Oocyte quality
Issue Date: Dec-2015
Publisher: Elsevier
Journal Title: Animal Reproduction Science
Volume: 163
Start Page: 172
End Page: 178
Publisher DOI: 10.1016/j.anireprosci.2015.11.009
PMID: 26588889
Abstract: 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/
http://creativecommons.org/licenses/by-nc-nd/4.0/
Type: article (author version)
URI: http://hdl.handle.net/2115/63729
Appears in Collections:獣医学院・獣医学研究院 (Graduate School of Veterinary Medicine / Faculty of Veterinary Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 永野 昌志

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