Table 2 Animal performances and plasma biochemical parameters in High versus Low residual feed intake (RFI) young bulls fed corn- or grass-silage diets.

From: Common and diet-specific metabolic pathways underlying residual feed intake in fattening Charolais yearling bulls

	Corn		Grass		SEM	P-value
	High-RFI	Low-RFI	High-RFI	Low-RFI	SEM	RFI	Diet	RFI × Diet
a. Performance and carcass traits
Initial BW\(^1\) (kg)	390	397	372	367	13.2	0.38	0.26	0.81
Final BW\(^1\) (kg)	730	725	650	698	19.1	0.26	0.01	0.19
Final back fat depth (mm)
12–13th rib	2.98	2.68	2.71	2.54	0.331	0.32	0.39	0.77
Lumbar	3.59	3.03	2.93	2.90	0.330	0.21	0.10	0.26
Gluteal	3.36	3.28	3.77	3.19	0.732	0.53	0.75	0.64
Hot carcass weight (kg)	431	444	410	449	10.3	0.01	0.41	0.20
Visceral fat\(^2\) (kg)	7.13\(^{\rm{a}}\)	5.28\(^{\rm{b}}\)	6.79\(^{\rm{a}}\)	7.89\(^{\rm{a}}\)	0.661	0.57	0.09	0.03
Visceral fat\(^2\) (%)	0.96\(^{\rm{a}}\)	0.73\(^{\rm{b}}\)	1.00\(^{\rm{a}}\)	1.10\(^{\rm{a}}\)	0.083	0.34	0.01	0.07
b. Metabolites and hormones
Urea (g/L)	0.21	0.18	0.15	0.12	0.010	0.01	< 0.01	0.82
NEFA (mol/L)	0.121	0.121	0.122	0.153	0.0182	0.40	0.36	0.37
BHB (mol/L)	0.344	0.311	0.238	0.241	0.0201	0.45	< 0.01	0.36
Glucose (g/L)	0.77	0.79	0.66	0.71	0.031	0.29	< 0.01	0.51
Insulin (\(\upmu\)IU/ml)	30.7\(^{\rm{a}}\)	20.7\(^{\rm{b}}\)	13.4\(^{\rm{a}}\)	15.7\(^{\rm{a}}\)	3.03	0.19	< 0.01	0.04
IGF-1 (ng/mL)	456	430	398	444	25.4	0.70	0.38	0.16
RQUICKI	0.28\(^{\rm{b}}\)	0.33\(^{\rm{a}}\)	0.36\(^{\rm{a}}\)	0.31\(^{\rm{a}}\)	0.021	0.79	0.16	0.02
c. Vitamins
FAD (\(\upmu\)mol/L)	0.22	0.22	0.22	0.22	0.009	0.64	0.99	0.58
Ribo (\(\upmu\)mol/L)	0.02	0.02	0.02	0.02	0.002	0.84	0.40	0.51
B2 total (\(\upmu\)mol/L)	0.24	0.23	0.24	0.24	0.010	0.70	0.87	0.69
FAD:B2 total	0.94	0.93	0.93	0.93	0.042	0.73	0.31	0.37
Ribo:B2 total	0.06	0.07	0.07	0.07	0.013	0.73	0.31	0.37
FAD:Ribo	15.0	14.0	14.0	14.2	1.21	0.68	0.60	0.50
P5P (\(\upmu\)mol/L)	0.38	0.39	0.38	0.33	0.030	0.49	0.13	0.14
PA (\(\upmu\)mol/L)	0.028	0.029	0.025	0.027	0.0021	0.29	0.02	0.70
B6 total (\(\upmu\)mol/L)	0.41	0.42	0.40	0.36	0.030	0.55	0.11	0.16
P5P:B6 total	0.93	0.93	0.94	0.93	0.004	0.28	0.79	0.13
PA:B6 total	0.07	0.07	0.06	0.07	0.004	0.28	0.79	0.13
P5P:PA	13.7	14.4	15.8	13.2	0.12	0.33	0.63	0.09

a,b: Means are compared only within each diet. Different letters means significant differences according to Tukey test (P < 0.05).
1: Body weight at the begining and the end of the RFI test.
2: Kindey, pelvic and mesenteric fat.
3: NEFA Non-esterified fatty acid, BHBA \(\beta\)-hydroxybutyrate, IGF-1 Insulin growth factor-1; RQUICKI index.

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Table 2 Animal performances and plasma biochemical parameters in High versus Low residual feed intake (RFI) young bulls fed corn- or grass-silage diets.

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