Fig. 2
From: Role of milk carbohydrates in intestinal health of nursery pigs: a review
Changes in G:F of nursery pigs fed diets by average daily lactose intake during 5 to 7 kg (A) and 7 to 11 kg (B) BW using a broken-line analysis. The meta-analysis is conducted by Proc NLMIXED in SAS 9.4 to determine break-points on the regression of feed efficiency of nursery pigs calculated based on the data from 10 published studies (Phase 1 for 5 to 7 kg BW: 14 experiments) and 14 published studies (Phase 2 for 7 to 11 kg BW: 23 experiments). The breakpoints (one-slope broken-line model) were average daily lactose intake at 45.61 g/d during 5 to 7 kg BW and 57.13 g/d during 7 to 11 kg BW when G:F were 0.79 and 0.77, respectively (P < 0.05). One-slope broken-line models; The equation for G:F during 5 to 7 kg BW was G:F = 0.79–0.12 × 10− 3 × z1, R2 = 0.89. The equation for G:F during 7 to 11 kg BW was G:F = 0.77–0.83 × 10− 4 × z1, R2 = 0.76 was; if average daily lactose intake is ≥ breakpoint, then z1 = 0; if average daily lactose intake is < breakpoint, then z1 = average daily lactose intake - breakpoint