Table 4.

Effects of graded levels of dietary beta-sitosterol supplementation on the diamine oxidase activity and D-lactate concentration in the plasma of broiler chickens.

Items	Beta-sitosterol level (mg/kg)					SEM1	P-values
	0	25	50	75	100		ANOVA2	Linear	Quadratic
14 d
Diamine oxidase (U/L)	18.10a	10.19c	13.21b	11.41bc	10.48bc	0.66	<0.001	<0.001	0.015
D-lactate (mmol/L)	0.74a	0.63b	0.48c	0.57bc	0.58bc	0.02	0.001	0.003	0.001
21 d
Diamine oxidase (U/L)	12.75	7.57	6.58	7.51	9.90	0.79	0.079	0.271	0.009
D-lactate (mmol/L)	0.52	0.49	0.49	0.41	0.43	0.01	0.071	0.011	0.844

^a-cMeans within a row with different superscripts are different at P < 0.05.

¹SEM, standard error of the mean (n = 6).

²ANOVA, analysis of variance.