Table 4.

Apparent nutrient digestibility and energy availability of high- and low-energy density diets fed to beef cows in confinement at 80% or 120% of NASEM (2016) predicted energy requirement¹

	High-energy diet2		Low-energy diet			Probability
Item3	80	120	80	120	SEM	Diet	Intake	Diet × intake
DMI, kg/d	3.74	5.43	5.49	7.84	0.101	<0.01	<0.01	<0.01
DMI, g/kg EBW0.75	44.62	63.98	63.09	87.78	1.33	< 0.01	<0.01	0.05
Digestibility, %
DM	65.9	62.8	58.9	57.2	1.44	<0.01	<0.01	0.40
OM	69.1	66.5	63.8	62.4	1.45	<0.01	0.01	0.43
ADF	49.9	52.8	58.1	57.7	2.25	<0.01	0.45	0.33
GE	68.3	65.9	63.	61.5	1.63	<0.01	0.04	0.74
Energy availability, Mcal/kg
GE	4.30		4.26
DE	2.94	2.83	2.69	2.62	0.062	<0.01	0.03	0.74
ME	2.41	2.32	2.21	2.15	0.051	<0.01	0.03	0.74
NEm	1.53	1.45	1.35	1.29	0.032	<0.01	0.03	0.74
Energy intake, kcal/kg EBW0.75
DE	131.23	181.42	170.34	230.27	3.604	<0.01	<0.01	0.16
ME	107.61	148.76	139.68	188.83	2.955	<0.01	<0.01	0.29
NEm	68.21	92.86	85.21	113.50	1.805	<0.01	<0.01	0.39
NEm intake, % requirement	75.83	108.24	94.88	132.70

¹Observed via feed and fecal nutrient analysis.

²Formulated NE_m concentrations for high- and low-energy diets were 1.54 and 1.08 Mcal/kg, respectively.

³DMI = dry matter intake; DM = dry matter; OM = organic matter; ADF = acid detergent fiber; GE = gross energy; DE = digestible energy; ME = metabolizable energy; NE_m = net energy for maintenance; EBW = empty body weight.