Maternal weight gain during gestation. Control C Sows (n = 10) received 2.3 kg/day food from day 25 to 110 gestation, E sows (n = 15) received 4.6 kg/day food in early gestation (days 25 to 50), M sows (n = 13) received 4.6 kg/day in mid gestation (days 50 to 80), EM sows (n = 12) received 4.6 kg/day in early and mid gestation (days 25 to 80) and L sows (n = 11) received 3.5 kg/day from days 80 to 110 of gestation. Colour coding; blue depicts weight gain from service to day 25 gestation, yellow depicts weight gain from day 25 to day 50 gestation, green depicts weight gain from day 50 to day 80 gestation and pink depicts weight gain from day 80 to day 110 gestation. Values represent Duncan’s means. Different superscripts indicate significant differences (P < 0.05) between treatments within the same time interval.