The delayed onset of estrus following lambing reduces the productivity of sheep. The present study was carried out to determine the key factors affecting the early onset of postpartum estrus in local ewes of Bangladesh. The effects of body weight, breed, season, presence of male following delivery, and suckling on the postpartum onset of estrus were observed. Seventeen ewes (12 Indigenous and 7 Garole) were used in this study. The pregnancy and delivery were monitored. All data were recorded. The indigenous ewes with higher body weight (14.87±0.27 kg) showed earlier postpartum onset of estrus (28.8±5.48 vs. 46±8.96 days) compared to lower body weight (12.89±0.48 kg). Similarly, the earlier postpartum onset of estrus (28.5±8.5 vs. 37±9.0 days) was observed in Garole ewes of higher body weight compared to lower body weight (28.3±2.65kg vs. 24.42±0.22kg). No significant difference was observed on Days of postpartum estrus onset between the breeds, although the Garole breed having higher body weight exhibited estrus earlier. The postpartum onset of estrus was earlier (27±7.56 vs. 44.57±7.47 days) during the breeding season compared to the non-breeding season in indigenous ewes. Indigenous ewes showed significantly (P
Key words: Body weight, Breed, Season, Male effect, Suckling
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