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Table 1 Impacts of dietary CP reductions on average (n = number of amino acids) apparent jejunal and ileal amino acid digestibility coefficients in broiler chickens offered maize- and wheat-based diets

From: Progress towards reduced-crude protein diets for broiler chickens and sustainable chicken-meat production

Feed grain,
n
CP
reduction,
g/kg
Distal jejunum Distal ileum Reference
Coefficients Response,
%
Range,
%
Coefficients Response,
%
Range,
%
Maize, 16 213 to 172 0.658 to 0.604 −8.21 −13.2 to −1.96 0.801 to 0.734 −8.36 −15.1 to − 2.67 [8]
Wheat, 16 215 to 165 0.594 to 0.600 + 1.01 − 16.0 to + 12.2 0.748 to 0.721 − 3.61 − 14.8 to + 2.13 [9]
Wheat, 16 213 to 197.5 - - - 0.740 to 0.795 + 7.43 + 3.19 to + 14.2 [10]
Maize, 17 210 to 165 0.459 to 0.594 + 29.4 + 16.8 to + 51.8 0.744 to 0.790 + 6.18 + 2.73 to + 10.8 [11]
Maize, 16 210 to 165 0.693 to 0.758 + 9.38 + 1.93 to + 34.5 0.792 to 0.797 + 5.98 − 0.43 to + 21.2 [12]
Maize, 16 208 to 165 0.617 to 0.665 + 7.78 −0.29 to + 19.6 0.789 to 0.776 − 1.65 − 7.41 to + 4.73 [13]
Maize, 15 222 to 165 - - - 0.797 to 0.771 − 3.87 − 32.2 to + 15.4 [14]
Wheat, 15 222 to 165 - - - 0.757 to 0.736 − 2.77 − 62.7 to + 14.5 [14]