Table 4.

Live performance and biometric gain of steers fed for 0–28, or 28–56 d and given maintenance (M) or ad libitum (A) intake and control (C) or zilpaterol hydrochloride (Z) treatment

Item	Treatments						SEM	P-value	Contrast P-values
	1–28 A	1–28 M	29–56 AZ	29–56 AC	29–56 MZ	29–56 MC			Daya	M vs. A	C vs. Z
n	24	24	8	8	8	8
Live performance
DMI, kg	8.85a	4.01b	8.96a	8.83a	4.22b	4.13b	0.227	<0.01	0.28	<0.01	0.57
BW gain, kg	28.9b	−14.1d	47.4a	35.2b	15.5c	10.3c	3.56	<0.01	<0.01	<0.01	0.05
ADG, kg	1.03b	−0.50d	1.69a	1.26ab	0.55c	0.37c	0.128	<0.01	<0.01	<0.01	0.05
G:F	0.113bc	−0.125d	0.182a	0.153ab	0.126abc	0.092c	0.021	<0.01	<0.01	<0.01	0.19
Carcass performanceb
Carcass gain, kg	21.2b	−6.79d	34.9a	15.9bc	21.0b	9.2c	2.65	<0.01	<0.01	<0.01	<0.01
Carcass ADG, kg	0.76b	−0.24d	1.25a	0.57bc	0.75b	0.33c	0.110	<0.01	<0.01	<0.01	<0.01
Carcass G:F	0.08c	−0.06d	0.14ab	0.07c	0.17a	0.09bc	0.017	<0.01	<0.01	0.02	<0.01
Carcass transferc, %	85.6b	44.4d	74.6bc	44.9cd	136.6a	57.1bcd	11.06	<0.01	0.08	0.22	<0.01
Biometric data
Hip height gain (mm/d)	0.48	0.11	0.33	0.59	0.22	0.18	0.205	0.20
Shoulder height gain (mm/d)	0.13b	0.46ab	1.13a	1.13a	0.33ab	−0.13b	0.306	0.05	0.28	<0.01	0.38

^a–dLeast squares mean s within a row with differing superscripts differ (P ≤ 0.05).

^aDay = harvest day.

^bCarcass performance calculated using dressing percentage for harvested steers to calculate HCW of nonharvested steers.

^cCarcass transfer = (HCW ADG/live ADG) * 100.