As dietary riboflavin level increased from 1.69 to 3.37 mg/kg,the body weight at 7,14,and 21 d of age,overall average daily gain (ADG),and average daily feed intake (ADFI) increased linearly and quadratically (P<0.001),and gain to feed ratio (G:F) increased quadratically (P=0.003),reaching a plateau at 3.37 mg riboflavin/kg for ADG and 4.05 mg riboflavin/kg for ADFI and G:F and no response with further increases.
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