Table 3.

Live weights and biometric data of steers fed to 0, 28, or 56 d on feed (0, 28, and 56) and given maintenance (M) or ad libitum (A) intake and control (C) or zilpaterol hydrochloride (Z) treatment

Item	0	28 A	28 M	56 AZ	56 AC	56 MZ	56 MC	SEM	P-value	0 vs. 28	0 vs. 56	28 vs. 56	M vs. A	C vs. Z
n	8	8	8	8	8	8	8
Start of trial BWa, kg	586	586	582	597	589	595	594	16.1	0.99
End of trial BWa, kg	586b	617ab	569b	667a	658a	595b	591b	17.5	<0.01	0.80	0.07	0.04	<0.01	0.68
Biometric data
Start hip height, cm	127	132	128	131	132	130	133	1.2	0.09	0.16	0.02	0.21	0.26	0.13
End hip height, cm	127c	133ab	130bc	133ab	136a	131b	133ab	1.4	<0.01	0.01	<0.01	0.10	0.01	0.07
Start shoulder height, cm	121	125	121	124	125	123	127	1.7	0.33
End shoulder height, cm	121	124	126	128	129	127	127	1.7	0.06	0.11	<0.01	0.06	0.65	0.61

^a–cLeast squares means within a row with differing superscripts differ (P ≤ 0.05).

^aBW is unshrunk because animals were not allowed feed and water for 9 h.