Table 2.

Mn supplementation and steroidal implants influence on live growth performance in beef steers¹

		MANG2			IMP3				P-value
	Mn0	Mn20	Mn50	SEM	NO	REV	SEM	MANG	IMP	MANG × IMP
Day −55 to 0
day −55 BW, kg	359	362	358	1.9	360	360	1.6	0.42	0.99	0.21
ADG, kg/d	1.87	1.95	1.85	0.043	1.89	1.89	0.035	0.26	0.91	0.37
DMI, kg/d	9.9	10.1	9.9	0.14	10.0	10.0	0.11	0.52	0.97	0.78
G:F	0.190	0.192	0.188	0.0036	0.189	0.190	0.0030	0.70	0.76	0.12
Day 0 to 56
day 0 BW, kg	463	467	461	2.3	464	464	1.9	0.22	0.96	0.34
day 56 BW, kg	561	560	565	2.9	556	569	2.4	0.49	0.01	0.66
ADG, kg/d	1.76ab	1.68b	1.82a	0.036	1.65	1.86	0.029	0.02	0.01	0.35
DMI, kg/d	10.6	10.6	10.8	0.17	10.6	10.7	0.13	0.69	0.77	0.78
G:F	0.168x	0.159y	0.168x	0.0034	0.155	0.174	0.0027	0.08	0.01	0.25
Day 56 to 89
Final BW	617	613	612	3.7	604	624	3.0	0.63	0.01	0.55
ADG, kg/d	1.66a	1.59ab	1.48b	0.055	1.44	1.71	0.045	0.06	0.01	0.43
DMI, kg/d	11.1	11.1	11.2	0.17	11.1	11.2	0.14	0.96	0.33	0.57
G:F	0.143a	0.137ab	0.129b	0.0044	0.127	0.146	0.0035	0.10	0.01	0.49
Overall
Overall ADG, kg/d	1.74	1.66	1.69	0.028	1.58	1.82	0.023	0.14	0.01	0.22
Overall DMI, kg/d	10.9	10.9	11.0	0.15	10.9	11.0	0.13	0.89	0.34	0.77
Overall G:F	0.157	0.150	0.153	0.0026	0.145	0.163	0.0021	0.18	0.01	0.25

¹Day −55 BW served as a covariate in analysis for all growth performance measures except for day −55 BW.

²Dietary treatments supplemented as MnSO₄: (1) no supplemental Mn (analyzed 14 mg Mn/kg DM; Mn0); (2) 20 mg supplemental Mn/kg DM (Mn20); (3) 50 mg supplemental Mn/kg DM (Mn50).

³A Revalor-200 implant was administered to REV on day 0 (Merck Animal Health, Madison, NJ); 200 mg TBA + 20 mg E2; REV).

^a,bWithin rows, means without a common superscript differ (P ≤ 0.05).

^x,yWithin rows, means without a common superscript differ (0.05 < P ≤ 0.10).