Table 3.

Mn supplementation and steroidal implants influence on carcass characteristics in beef steers¹

		MANG3				IMP4			P-Value
	Mn0	Mn20	Mn50	SEM	NO	REV	SEM	MANG	IMP	MANG × IMP
HCW, kg	393	391	390	2.0	384	398	2.0	0.54	0.01	0.20
REA, cm2	84.6a	81.3b	82.6ab	0.8	82.0	83.7	0.6	0.01	0.07	0.98
RF, cm	1.53b	1.50b	1.68a	0.06	1.56	1.58	0.05	0.08	0.82	0.26
DP, %	63.9	63.6	63.7	0.002	63.6	63.8	0.002	0.55	0.35	0.45
Yield Grade5	3.56	3.64	3.91	0.086	3.65	3.83	0.069	0.25	0.84	0.23
Marbling2	489	514	493	12.4	483	495	10.2	0.45	0.34	0.94
KPH, %	2.7	2.6	2.6	0.11	2.2	2.8	0.09	0.36	0.34	0.12

¹Day −55 BW served as a covariate in analysis. Hot carcass weight (HCW), ribeye area (REA), 12th rib fat (RF), dressing percentage (DP), empty body fat percentage (EBF), kidney, pelvic, and heart fat (KPH).

²Marbling scores: slight: 300, small: 400, and modest: 500.

³Dietary 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).

⁴A Revalor-200 implant was administered to REV on day 0 (Merck Animal Health, Madison, NJ); 200 mg TBA + 20 mg E2; REV).

⁵Yield grade (YG) was calculated utilizing the USDA yield grade equation.

^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).