There were no differences among BiW classes in the first (P=0.480) and second (P=0.400) farrowing rate but piglets of 1000-1160 g and 1510–1610 g had lower third farrowing rate (P=0.041) than piglets weighing >1620 g.The total number of piglets born(P=0.08)and piglets born a live(P=0.028) were lower for the lightest BiW class in the first farrowing but they were similar among BiW classes in the second and third farrowing. The percentage of first-mated gilts that reached the third farrowing (68.7%) was not affected by BiW (P>0.05).The third farrowing was reached at 627.4±1.17 days of age on average,with no significant difference among BiW classes (P=0.806). Females born weighing less than 1 kg produced about 4.5 fewer piglets along three parities than the other BiW classes(P≤0.05). Female piglets weighing between 1.0 and 1.28 kg at birth were also negatively affected in terms of lifetime herd days,although to a less extent than those weighing less than 1 kg, in comparison with piglets weighing >1.28 kg. However, the number of herd days, from selection for entry into the breeding herd to the third
farrowing or removal,was not different (P=0.257) among BiW classes.The results of this study show that low
BiW (01 kg) negatively influences the production of piglets and longevity of female swine.