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

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]