Table 4. Effects of supplementation with rumen-protected choline (T_C), rumen-protected methionine (T_M) or both (T_CM) on the plasma levels of biochemical parameters (means of whole period) in transition dairy cows¹.

Items	T0	TC	TM	TCM	SEM	P-value
						C	M	C×M
TP, g/L	72.48	73.82	72.78	73.29	0.524	0.083	0.824	0.432
ALB, g/L	35.24	36.33	35.97	35.89	0.363	0.174	0.700	0.112
GLB, g/L	37.23	37.49	36.80	37.40	0.699	0.543	0.714	0.807
TBIL, μmol/L	3.70	3.51	3.60	3.43	0.034	<0.001	0.007	0.771
GPT, U/L	20.18	19.90	20.95	18.70	0.533	0.022	0.070	0.687
GOT, U/L	86.84	85.54	86.43	84.17	0.800	0.031	0.271	0.546
ALP, U/L	49.61	48.04	48.35	46.82	0.611	0.014	0.049	0.974
BUN, mmol/L	2.12	2.00	1.97	1.90	0.063	0.138	0.043	0.693

¹TP = total protein, ALB = albumin, GLB = globulin, A/G = ALB/GLB, TBIL = total bilirubin, GPT = glutamate pyruvate transaminase, GOT = glutamic oxalacetic transaminase, ALP = alkaline phosphatase, and BUN = blood urea nitrogen. Blood samples were collected at -21, -14, -7, 0, 7, 14, and 21 d.