Table 1.

Feed intake, RFI and growth traits for the entire population of low and high RFI steers during different dietary phases

Trait	Diet-Breed	Low (S.D.)	High (S.D.)	P-value
DMI (kg/d)	H1.CH	7.8 (0.68)	9 (0.58)	< 0.001
	H1.HF	8.3 (0.87)	9.3 (0.68)	< 0.001
	ZG.CH	8.8 (0.48)	9.4 (0.42)	< 0.001
	ZG.HF	9.1 (0.47)	10 (0.48)	< 0.001
	H2.CH	10.8 (0.69)	12.3 (0.90)	< 0.001
	H2.HF	11.6 (1.18)	13.6 (1.25)	< 0.001
RFI (kg DM/d)	H1.CH	−0.5 (0.15)	0.56 (0.17)	< 0.001
	H1.HF	−0.5 (0.27)	0.53 (0.26)	< 0.001
	ZG.CH	−0.35 (0.16)	0.35 (0.17)	< 0.001
	ZG.HF	−0.42 (0.27)	0.56 (0.18)	< 0.001
	H2.CH	−0.75 (0.29)	0.76 (0.39)	< 0.001
	H2.HF	−1.01 (0.54)	1.03 (0.28)	< 0.001
ADG (kg)	H1.CH	1.3 (0.36)	1.4 (0.26)	0.43
	H1.HF	1.4 (0.35)	1.4 (0.20)	0.78
	ZG.CH	1.4 (0.14)	1.4 (0.22)	0.96
	ZG.HF	1.2 (0.18)	1.3 (0.24)	0.85
	H2.CH	1.4 (0.25)	1.4 (0.28)	0.64
	H2.HF	1.3 (0.47)	1.3 (0.16)	0.98
MBW (kg)	H1.CH	95 (5.15)	96 (5.77)	0.79
	H1.HF	81 (7.81)	80 (6.12)	0.90
	ZG.CH	116 (7.26)	115 (6.41)	0.80
	ZG.HF	102 (3.34)	104 (8.34)	0.90
	H2.CH	139 (6.91)	140 (7.28)	0.79
	H2.HF	131 (8.41)	141 (9.50)	0.90

DMI dry matter intake, RFI residual feed intake, ADG average daily gain, MBW metabolic body weight, CH Charolais, HF Holstein-Friesian, Low low RFI, High high RFI, S.D. Standard deviation, H1 high concentrate diet 1, H2 high concentrate diet 2, ZG zero-grazed grass diet