Successful pregnancy in estrus-synchronized Himalayan tahrs (Hemitragus jemlahicus) by transcervical insemination
- Author:
Hwanyul YONG
1
;
Jongki CHO
Author Information
- Publication Type:Research Report
- From:Journal of Veterinary Science 2025;26(6):e79-
- CountryRepublic of Korea
- Language:English
-
Abstract:
Objective:To evaluate the effectiveness of transcervical insemination using extended-fresh (EF) and extended-chilled (EC) semen following estrus synchronization using controlled internal drug release (CIDR) and hormonal treatments in female Himalayan tahrs.
Methods:This study involved eight female Himalayan tahrs, which were divided into two treatment groups of 13-day and 15-day according to duration of CIDR insertion. Hormonal treatments including pregnant mare serum gonadotropin, human chorionic gonadotropin, and prostaglandin F2 alpha (PGF2α ) were administered. Semen was collected from two males by electroejaculation, extended, and used either fresh, frozen-thawed, or chilled.Transcervical insemination was performed at fixed times after CIDR removal, and pregnancy was diagnosed 64 days post-insemination using Doppler ultrasonography.
Results:Three of four females in the 13-day group and one of four in the 15-day group were confirmed pregnant. Vaginal and cervical changes were more favorable for insemination in the 13-day group. Hormonal data supported that a sharp drop in progesterone after CIDR removal was associated with successful conception.
Conclusions:and Relevance: Thirteen-day CIDR insertion combined with gonadotropins and PGF2α is effective for estrus synchronization in Himalayan tahrs. Transcervical insemination using EF and EC semen resulted in successful pregnancy, offering a practical and reproducible protocol for ex situ conservation breeding in this species.
