Graded methionine dietary inclusions influence growth performance and apparent ileal amino acid digestibility coefficients and disappearance rates in broiler chickens.

Therefore, it is noteworthy that significant negative linear relationships between feed intakes and ileal digestibility coefficients were detected for 10 amino acids and negative linear relationships approached significance ( P < 0.01) for a further 5 amino acids as shown in Table 9 .

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In contrast, digestibility coefficients of the balance of 15 amino acids were compromised in a quadratic manner to highly significant extents.

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