Journal of Equine Science
Online ISSN : 1347-7501
Print ISSN : 1340-3516
ISSN-L : 1340-3516
Note
Seasonal changes in serum progesterone levels in Thoroughbred racehorses in training
Yuji TAKAHASHIMakoto AKAIHarutaka MURASEYasuo NAMBO
Author information
JOURNAL FREE ACCESS

2015 Volume 26 Issue 4 Pages 135-139

Details
Abstract

The objective of the present study was to verify the seasonal luteal activity of racehorses in training in Japan from March to August. We allocated 102 horses into a luteal activity group and non-luteal activity group. The luteal activity group included horses with serum progesterone levels that were consistently >1 ng/ml and changed by ± 1 ng/ml. In contrast, the progesterone levels of the non-luteal activity group were consistently <1 ng/ml. In late spring (from May 1 to June 30) and summer (from July 1 to August 31), the percentage of horses in the luteal activity group was significantly higher than in early spring (from March 1 to April 30, P<0.01). These findings demonstrate clear seasonal variations in ovarian activity. The present study also suggest that training for a race may not affect ovarian activity in female racehorses.

Content from these authors

この記事はクリエイティブ・コモンズ [表示 - 非営利 - 改変禁止 4.0 国際]ライセンスの下に提供されています。
https://creativecommons.org/licenses/by-nc-nd/4.0/deed.ja
Previous article Next article
feedback
Top