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Changes in G:F of pigs fed diets with whey permeate using a broken-line analysis. The breakpoint (one-slope broken-line model) was 13.6% whey permeate supplementation when G:F was 0.852 (P < 0.05). One-slope broken-line model; the equation for G:F is y = 0.852 – 0.006 × z1; if whey permeate supplementation is ≥ breakpoint, then z1 = 0; if whey permeate supplementation is < breakpoint, then z1 = breakpoint − whey permeate supplementation.
