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VH:CD of nursery pigs fed diets with increasing levels of nucleotide on day 21. The nucleotide supplementation that maximized VH:CD was calculated to be 247 mg/kg; the quadratic model: Eq. Y = −3·10−6·X2 − 15·10−4·X + 2.022: X = nucleotide supplementation (mg/kg); Y = VH:CD; P < 0.05; R2 = 0.91.
