Table 5.

Body measurements of beef cows in confinement fed high- and low-energy density diets at 80% or 120% of NASEM (2016) predicted energy requirement

	High-energy diet1		Low-energy diet			Probability
Item	80	120	80	120	SEM	Diet	Intake	Diet × intake
Initial measurements
EBW,2 kg	370	358	388	393	9.2	<0.01	0.65	0.34
EBW0.75, kg	84.44	82.31	87.49	88.25	1.563	<0.01	0.74	0.37
Hip fat, mm	4.19	3.24	6.19	5.27	1.067	0.05	0.34	0.99
Rib fat, mm	2.64	3.05	4.79	5.27	0.976	0.02	0.62	0.97
Intramuscular fat, %	2.91	2.47	2.94	2.90	0.262	0.35	0.33	0.43
Ribeye area, cm2	57.44	64.52	64.52	67.58	3.570	0.08	0.08	0.48
Final measurements
EBW, kg	387	393	401	408	11.4	0.19	0.54	0.91
EBW0.75, kg	87.30	88.21	89.54	90.84	1.900	0.17	0.48	0.96
Hip fat, mm	2.79	3.18	5.08	4.89	0.931	0.03	0.91	0.75
Rib fat, mm	2.48	2.98	4.16	5.21	1.029	0.04	0.39	0.76
Intramuscular fat, %	2.92	2.54	2.70	3.05	0.246	0.52	0.93	0.12
Ribeye area, cm2	57.67	66.37	62.82	67.11	3.483	0.32	0.04	0.45
Change in measurements
EBW, kg	17	35	12*	15	6.9	0.08	0.12	0.27
EBW0.75, kg	2.86	5.90	2.05	2.59	1.164	0.07	0.11	0.26
Hip fat, mm	−1.40	−0.06*	−1.11*	−0.39*	0.580	0.97	0.06	0.56
Rib fat, mm	−0.16*	−0.06*	−0.06*	−0.02*	0.356	0.48	0.25	0.39
Intramuscular fat, %	0.02*	0.07*	−0.24*	−0.14*	0.150	0.55	0.15	0.26
Ribeye area, cm2	−3.44*	1.85*	−1.69*	−1.20*	2.215	0.77	0.20	0.29

¹Formulated NE_m concentrations for high- and low-energy diets were 1.54 and 1.08 Mcal/kg, respectively.

²EBW = empty body weight.

*Means are not different from zero (P > 0.05).