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The average daily feed intake (ADFI) and average daily gain (ADG) obtained with six dietary zinc concentration during (A,D) the first week post-weaning (PW), (B,E) the second week PW and (C,F) the two first weeks PW. The dashed lines illustrate the effect of dietary zinc concentration on ADFI or ADG. The turning point and p-value of the linear and quadratic parameters are denoted at the top of each graph.
