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タイトル: Changes in Follicular Vascularity during the First Follicular Wave in Lactating Cows
著者: ACOSTA, Tomas J.
HAYASHI, Ken-Go
MATSUI, Motozumi
MIYAMOTO, Akio
松井, 基純
宮本, 明夫
キーワード: Blood flow
Follicular wave
Selection
Deviation
Cow
発行日: 2005
出版者: 日本繁殖生物学会
誌名: Journal of Reproduction and Development
巻: 51
号: 2
開始ページ: 273-280
抄録: Increase in the blood supply to individual follicles appears to be associated with follicular growth rates and the ability to become the dominant follicle, while reduced thecal vascularity appears to be closely associated with follicular atresia. Therefore, this study aimed to determine the real-time changes in the vascularity of the follicle wall during the first follicular wave in cycling Holstein cows. Normally cycling and lactating cows (n=5) were examined by transrectal color Doppler ultrasonography (the sensitivity for velocity: > 2 mm/sec) to determine the changes in the vasculature of the follicle wall (presence or absence of blood flow) and the diameter of follicles. A new follicular wave and ovulation were induced by GnRH injection at 48 h after an injection of PGF2α analogue. The ovaries were scanned daily for 7 days after GnRH injection. Follicles >2.5 mm were classified into 3 groups by the changes in diameter as follows: 1) largest follicle, 2) second largest follicle, and 3) small follicles, which included all other follicles >2.5 mm. Before the follicle selection, there was no significant difference in the percentage of follicles with detectable blood flow between the subsequently determined largest and second largest follicles. After the follicle selection, the percentage of follicles with detectable blood flow significantly decreased among the second largest follicles. In addition, small follicles with detectable blood flow kept larger diameters than those without detectable blood flow from one day before the occurrence of follicle selection. It is likely that maintenance of follicle vasculature and appropriate blood supply to the larger follicles is essential for follicle dominance. In small follicles, the presence of blood flow within the wall also appears to be required for recruitment. Consequently, the data suggest that the change of the blood supply to an individual follicle closely relates to the dynamics of follicular growth in the first follicular wave in the cow.
URI: http://ir.obihiro.ac.jp/dspace/handle/10322/2979
ISSN: 13484400
09168818
権利情報: 日本繁殖生物学会
出現コレクション:00A01学術雑誌論文

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