A total of 456 dams were mated at the first postweaning estrus. The weaning-remating interval did not differ between sows and gilts from the treatment pregnancy (P = 0.135) or between maternal treatment groups in the treatment pregnancy (P = 0.535). The proportion of dams that farrowed after this subsequent mating tended to be greater in gilts than in sows (P = 0.069; gilts: 80.7%; sows: 73.6%), largely because of parity differences in conception rates (Table 4). Treatment in the previous pregnancy did not affect subsequent litter size (P > 0.16 for all measures). The numbers of total born (12.0 ± 0.2), live-born (11.0 ± 0.2), and mummified (0.20 ± 0.03) piglets were similar in dams that were gilts or sows during the previous (treatment) pregnancy (P > 0.1 for each). Parity did affect the numbers of stillborn piglets, which were greater in sows of greater parity (gilts at the previous pregnancy: 0.8 ± 0.1; sows at the previous pregnancy: 1.2 ± 0.1; P = 0.024).