Resumo

BALAN-MAY, Daniel et al. Short-term protocols for the estrus synchronization in hair sheep in Campeche, Mexico. Abanico vet [online]. 2021, vol.11, e123.  Epub 04-Abr-2022. ISSN 2448-6132.  https://doi.org/10.21929/abavet2021.34.

Estrus synchronization is a strategy to improve the reproductive efficiency of the herd. The objective was to compare different dwells times of an intravaginal progestogen (CIDR®) with a dose of PGF2α in the synchronization to estrus of hair sheeps. Thirty female hair sheeps were used, randomly assigned to one of three treatments. T1: intravaginal progestogen (PI) for 5 days (PI5; n=10), T2: PI for 7 days (PI7; n=10) and T3: PI for 9 days (PI9; n=10). The incidence and onset of estrus, parturition and prolificacy were observed. Data analysis was performed using the life time method, logistic regression models and negative binomial models. The incidence at estrus was not different (p> 0.05) among treatments (T1: 80.0, T2: 100.0 and T3: 100.0%). Onset to estrus was lower (p ≤ 0.0) for T1 (29.8 ± 2.9 h) compared to the rest of the treatments. No differences (p> 0.05) were observed for parturition (T1: 70.0, T2: 90.0 and T3: 90.0%) and prolificacy (T1: 1.4 ± 0.3, T2: 1.4 ± 0.3 and T3: 1.5 ± 0.3). It is feasible to use short synchronization protocols based on intravaginal progestogens (CIDR®) with a dose of PGF2α and maintain the reproductive efficiency of the herd.

Palavras-chave : CIDR; progesterone; devices; fertility; ewes.

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