Characterization of weaning-to-estrus interval and consequences of its variation on reproductive performance of swine females

A influência da ordem de parto (OP) e da duração da lactação (DURLAC) sobre o intervalo desmame-estro (IDE) foi avaliada em 20669 registros de cobertura oriundos de duas granjas comerciais de suínos. As fêmeas foram classificadas de acordo com OP e DURLAC em quatro classes: OP 1, 2, 3-6 e >6; DURLAC 13-15 (somente na granja B), 16-19, 20-22 e 23-26 dias. As fêmeas também foram agrupadas, em oito classes, de acordo com o IDE sendo 0, 1, 2, 3-5, 6-8, 9-12, 13-18 e 19-21 dias. Mais do que 67% e 62% das fêmeas de todas as classes de ordem de parto e duração da lactação, respectivamente, concentraram seu estro entre 3 e 5 dias. Maior percentagem (P1 dia (P6 and LL 13-15 (only in the farm B), 16-19, 20-22 and 23-26 days. Females were grouped in 8 classes according to WEI, being 0, 1, 2, 3-5, 6-8, 9-12, 13-18 and 19-21 days. More than 67% and 62% of the females of all parities and lactation length classes, respectively, concentrated their estrus between 3 and 5 days. A higher percentage (P1 day (P<0.05). Females with WEI of 1, 2, 6-8 and 9-12 days had farrowing rates lower than that of females with WEI of 3-5 days (P<0.05). Females with short WEI (0-2 days) showed litter size lower (P<0.05) than that observed in females with WEI of 13 to 21 days. A reduction in subsequent litter size was also observed in females with WEI of 6-8 days when compared to WEI of 3-5 days (P