Fig. 1From: Utilization and reproductive performance of gilts in large-scale pig farming system with different production levels in China: a descriptive studyLitter proportion distribution of gilts at different production level. The proportion distribution peaks of litter production in HP farms were shifted about two more than those in LP groups, respectively; and the proportion of low litter production (eight per litter or less) was lower than that in LP groups. Values represent Mean ± SEM. (HP farms, n = 11,833; LP-Total groups, n = 24,014; LP-BP groups, n = 10,952; LP-CP groups, n = 13,062). a,b,c,dBars with different letters differ significantly (P < 0.05)Back to article page