Table 3.

Excreta characteristics and retention of nutrients in low and high residual feed intake (RFI) broiler chickens fed either ad libitum or restrictively¹.

Item	ad libitum feeding		Restrictive feeding			P-value
	Low RFI	High RFI	Low RFI	High RFI	SEM	Restr.2	RFI	Restr. × RFI
DM content, %	18.6abB	20.1aA	19.3ab	18.0b	0.60	0.282	0.901	0.021
pH	6.8	6.8	6.7	6.6	0.14	0.344	0.976	0.703
Ammonia, μmol/g fresh sample	63.4	96.3	80.6	95.0	9.62	0.413	0.017	0.342
RETENTION OF, %
DM	85.2b	85.1b	84.5b	88.4a	0.81	0.124	0.022	0.015
Crude ash	57.9b	57.7b	56.1b	66.1a	2.22	0.141	0.033	0.026
CP	81.6b	79.8b	80.7b	85.1a	1.13	0.051	0.250	0.009
Phosphorus	65.0b	62.5b	64.2b	73.1a	1.81	0.010	0.086	0.003

¹Data are presented as least-square means ± pooled standard error of the mean (SEM). n = 7 per feeding level group, RFI rank, and sex; except for n = 8 high RFI ad libitum females.

²Restr., restrictive feeding.

^{a, b}Different superscripts within a row indicate significant difference (P ≤ 0.05).

^{A, B}Different superscripts within a row indicate a tendency (P ≤ 0.10).

The bold values should be self-explanatory. That are the P-value which indicate significance.