Table 4. Effects of dietary crude protein contents on blood metabolites.

Item	Diet1)		SEM	Gender			SEM	p-value
	Control	HCP		Cow	Heifer	Steer		Diet	Gender	Interaction
Glucose (mg/dL)	65.62	83.28	9.054	62.76	89.17	71.42	13.307	0.18	0.24	0.06
Total cholesterol (mg/dL)	166.99	159.39	9.433	133.05b	188.83a	167.70ab	13.864	0.57	< 0.01	0.31
Triglycerides (mg/dL)	16.26	20.78	2.181	20.68a	23.33a	11.56b	3.206	0.15	0.02	0.25
BUN (mg/dL)	17.80	19.47	0.803	17.34b	21.80a	16.76b	1.180	0.16	0.01	0.12
Creatinine (mg/dL)	1.35	1.38	0.061	1.28	1.44	1.38	0.090	0.77	0.26	0.62
GOT (IU/L)	116.98	123.89	8.399	122.04	138.92	100.35	12.344	0.57	0.07	0.25
GPT (IU/L)	17.73	17.75	0.749	17.38	18.79	17.03	1.100	0.99	0.45	0.06
Ca (mg/dL)	8.88	8.91	0.271	8.76	9.03	8.89	0.398	0.93	0.83	0.82
IP (mg/dL)	6.19	6.32	0.234	5.52b	6.77a	6.48a	0.344	0.70	< 0.01	0.29
Mg (mg/dL)	2.10	2.08	0.083	1.87b	2.25a	2.15ab	0.122	0.84	0.02	0.58
Albumin (g/dL)	3.13	3.19	0.099	3.10	3.27	3.10	0.145	0.69	0.61	0.70
Total protein (g/dL)	6.46	6.58	0.240	6.69	6.52	6.36	0.353	0.73	0.67	0.69
Total bilirubin (mg/dL)	0.02	0.02	0.009	0.03	0.03	< 0.01	0.014	0.87	0.18	0.29

¹⁾Control, containing 156 g/kg DM of CP; HCP, high level of crude protein, contained 173 g/kg DM of CP.

^a,bMeans that do not significantly differ with common superscripts within treatments (p < 0.05).

BUN, blood urea nitrogen; GOT, glutamic oxaloacetic transaminase; GPT, glutamate pyruvate transaminase; IP, inorganic phosphate.