Fig. 3

Models developed from literature to determine the response of dietary lactose level on predicted daily feed intake (ADFI, g/d), average daily gain (ADG, g/d) and G:F (ADG: ADFI) of weanling pigs. Meta-analysis was performed using GLM procedure of SAS 9.4. The linear and quadratic equations of ADFI, ADG and G:F were predicted, and only the quadratic equations are presented. a the ADFI, ADG or G:F responses of d 0–7 post-wean piglets in relation to dietary lactose level were predicted by using 12 studies (n = 38); b the ADFI, ADG or G:F responses of d 7–14 post-wean piglets to dietary lactose level were predicted by using 10 studies (n = 40); c the ADFI, ADG or G:F responses of d 14–35 post-wean piglets to dietary lactose level were predicted by using 9 studies (n = 54)