Table 2.

Age-related changes in serum biochemical parameters and hepatic lipid accumulation of laying hens.

	Treatments
Items	D195	D340	D525	SEM	P-value
Serum
Albumin (g/L)	26.44	26.00	26.51	0.291	0.756
Globulin (g/L)	36.74a	35.56ab	31.99b	0.789	0.030
Glucose (mmol/L)	13.03	13.11	12.81	0.347	0.943
HDL-C (mmol/L)	0.78	0.77	0.66	0.056	0.657
LDL-C (mmol/L)	0.20	0.21	0.24	0.020	0.794
Total cholesterol (mmol/L)	2.79	3.01	3.64	0.170	0.101
Total protein (g/L)	63.17a	61.56ab	58.49b	0.806	0.047
Triglyceride (mmol/L)	9.41	9.55	10.58	0.428	0.501
Liver
Total cholesterol (mmol/g protein)	0.190b	0.215ab	0.242a	0.008	0.021
Triglyceride (mmol/g protein)	0.398b	0.424ab	0.451a	0.008	0.027

Abbreviations: D195, 195-day-old laying hens; D340, 340-day-old laying hens; D525, 525-day-old laying hens; HDL-C, high density lipoprotein cholesterol; LDL-C, low density lipoprotein cholesterol.

^abMean values within a row with different superscripts letters are significantly different at P < 0.05.