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Relationship between bovine endometrial thickness and plasma progesterone and estradiol concentrations in natural and induced estrus

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Title: Relationship between bovine endometrial thickness and plasma progesterone and estradiol concentrations in natural and induced estrus
Authors: Sugiura, Tomochika Browse this author
Akiyoshi, Shun Browse this author
Inoue, Fumihiro Browse this author
Yanagawa, Yojiro Browse this author
Moriyoshi, Masaharu Browse this author →KAKEN DB
Tajima, Motoshi Browse this author →KAKEN DB
Katagiri, Seiji Browse this author →KAKEN DB
Keywords: Dairy cows
Estrous cycle
Issue Date: Apr-2018
Publisher: Society for Reproduction and Development(SRD)
Journal Title: Journal of reproduction and development
Volume: 64
Issue: 2
Start Page: 135
End Page: 143
Publisher DOI: 10.1262/jrd.2017-139
Abstract: The objective of this study was to investigate cyclical changes in endometrial thickness in relation to progesterone (P-4) and estradiol-17 beta (E-2) concentrations during natural and induced estrus in 15 cows. In the prostaglandin (PG) F-2 alpha induced estrus group, ultrasonography (USG) at 6-h intervals was used to determine endometrial thickness 48-24 h before the PGF(2 alpha), treatment until 24 h after ovulation (ovulation = Day 0). In the natural estrus group, USG was performed every 48 h from Day 3 to Days 15-18 after the first ovulation, and then every 6 h until 24 h after ovulation. Endometrial thickness was standardized using Day 13 as a reference day. Blood was collected during every USG examination and plasma P-4 and E-2 concentrations were determined. Endometrial thickness of the induced estrus group (n = 11) was greater than that of the natural estrus group (n = 9) between 60 and 12 h before ovulation (P < 0.05). In the natural estrus group, prior to an increase in endometrial thickness, a decrease in P-4 and an increase in E-2 were detected. In the induced estrus group, based on the time of ovulation, an increase in endometrial thickness was detected at the same time of a decrease in P-4 before an increase in E-2. These results suggest that decreases in P-4 concentrations may be a cue to changes in endometrial thickness, while increases in E-2 concentrations appear to sustain and/or enhance these changes.
Rights: © 2018 by the Society for Reproduction and Development
Type: article
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: 片桐 成二

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