Table 4.

Effect of plane of nutrition and week of sampling on plasma metabolites in Holstein Friesian bull calves (n = 30) offered a high (HI) or moderate (MOD) plane of nutrition from 2 to 12 wk of age

	Diet		SEM	Age			SEM	P-value
Blood metabolite	HI	MOD		2 wk	7 wk	12 wk		Treatment	Week	Treatment × week
Cholesterol, mmol/L	2.44	2.22	0.078	2.43	2.43	2.15	0.07	0.056	0.0008	0.28
Glucose, mmol/L	5.98	5.23	0.16	6.04	5.82	4.95	0.16	0.003	<0.0001	0.83
BHB, mmol/L	0.09	0.197	0.006	0.08	0.15	0.20	0.009	<0.0001	<0.0001	0.0061
NEFA, mmol/L	0.10	0.08	0.009	0.09	0.097	0.08	0.008	0.12	0.14	0.036
Insulin, μl/mL	22.88	15.35	3.498	20.01	18.98	15.62	4.36	0.048	0.97	0.16
IGF-1, ng/mL	333.31	153.64	11.63	112.08	278.54	339.81	12.66	<0.0001	<0.0001	<0.0001