Table 6.

Effects of dietary treatments on parameters of nutrient utilisation in broiler chickens from 18 to 20 d post–hatch.

L-Methionine, g/kg	AME, MJ/kg	AME:GE ratio	N retention, %	AMEn, MJ/kg
0	12.59	0.670a	66.04b	11.31
1.38	12.43	0.655ab	70.33a	11.03
2.76	12.39	0.654ab	71.08a	11.04
4.14	12.14	0.635b	70.08a	10.77
SEM	0.123	0.0080	0.988	0.135
Significance (P = )	0.105	0.0048	0.008	0.071
Quadratic (r = )	0.497	0.541	0.661	0.507
(P = )	0.051	0.026	0.002	0.045

AME = apparent metabolizable energy; GE = gross energy; AMEn = nitrogen corrected AME; SEM = standard error of the mean.

^{a, b} Mean values within columns not sharing a common superscript are significantly different at the 5% level of probability.