Lack of LH Response to Exogenous Estradiol in Heifers with ACTH-Induced Ovarian Follicular Cysts

Journal of Veterinary Medical Science

Wen Chang Zhang¹  Yoshinobu Tanaka¹  Abdullahi Y. Ribadu¹  Masaharu Moriyoshi¹  Ken Nakada¹  Toshihiko Nakao¹ 

[1] Department of Veterinary Obstetrics & Gynecology, Rakuno Gakuen University, 582-1 Bunkyodai-Midorimachi, Ebetsu, Hokkaido 069-8501, Japan

关键词: heifer;    luteinizing hormone;    ovarian cyst;   

DOI  :  10.1292/jvms.61.979

学科分类：兽医学

来源: Japanese Society of Veterinary Science

【 摘 要 】

References(23)Cited-By(7)The aim of the present study was to examine the LH response to exogenous estradiol in 4 heifers with ACTH-induced ovarian follicular cysts. During the control experiment, administration of estradiol 24 hr after PGF2α in luteal phase heifers resulted in a LH response in all 4 heifers. The LH response was obtained between 16-20 hr after estradiol administration. The peak LH concentration (Mean ± SEM; 5.1 ± 0.8 ng/ml) during the control study was significantly different (P<0.05) from the concentration after cyst formation. None of the 4 heifers responded to estradiol after ovarian cyst formation. This result suggests that heifers with ACTH-induced ovarian follicular cysts may have a defective hypothalamio-pituitary response to exogenous estradiol similar to cows with spontaneous ovarian cysts.

【 授权许可】

Unknown