Estrus synchronization and follicular development patterns in jennies

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◆ 논문 초록 (Abstract)

BACKGROUND: Seasonal variations and breed differences significantly influence reproductive efficiency in jennies, yet optimized, evidence-based estrus synchronization protocols for key Chinese breeds are lacking. AIMS/OBJECTIVES: This study aimed to compare the efficacy of three hormonal protocols on estrus synchronization, and to characterize follicular development patterns in DeZhou and Xinjiang jennies across different seasons. METHODS: In two experiments (April-May, n = 94; July-August, n = 144), 238 non-pregnant jennies received one of three treatments: GnRH-PGF2α with two injection timings (Treatment Group 1 and 2), or a Controlled Internal Drug Release (CIDR) insert combined with GnRH-PGF2α (Treatment Group 3). Estrus, ovulation, and conception rates were recorded. Follicular dynamics were assessed daily via ultrasonography in 125 jennies (68 DeZhou, 57 Xinjiang). RESULTS: During April-May, TG3 achieved a higher total estrus rate (85.0% vs. 53.0% and 72.5% in TGs1 and 2, respectively, P < 0.05) and conception rate (81.3% vs. 66.7% and 71.4%, P < 0.05). Reproductive outcomes were superior in April-May versus July-August (P < 0.05). Xinjiang jennies exhibited a faster follicular growth rate (5.52±2.56 mm/d) compared to DeZhou jennies (4.32±1.64 mm/d, P < 0.05), while DeZhou jennies had larger pre-ovulatory follicles (44.99±1.70 mm vs. 31.29±0.95 mm, P < 0.05). No significant lateral preference in ovulation was observed (left ovary: 54.2%, right ovary: 45.8%). CONCLUSION: The CIDR+GnRH-PGF2α protocol applied in April-May most effectively synchronized estrus and improved conception rates in jennies. Follicular growth patterns differed between breeds, informing breed-specific insemination timing. No ovarian lateralization was detected.

◆ 원문 정보
저자: Ayiken N, Tuohudashen Y, Huojiaabudula Y, Abudureyimu A, Wang H et al.
저널: J Equine Vet Sci
연도: 2026
DOI: 10.1016/j.jevs.2026.105799

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