Table 5. Effects of dietary supplementation of grape seed proanthocyanidin on antibody titres against ND and IB vaccines in broiler chicks^1),2)

	NC	PC	Proanthocyanidin		SEM	p-value
	NC	PC	10ppm	100ppm	SEM	p-value
ND titre (log10)
0d	2.13	1.88	1.80	1.83	0.11	0.17
7d	2.38^b	2.75^b	4.25^a	4.50^a	0.16	<0.05
14d	5.50^c	5.50^c	5.88^b	7.00^a	0.16	<0.05
IB titre (log10)
0d	0.00	0.00	0.50	0.50	0.05	0.18
7d	0.50	1.25	1.65	1.63	0.06	0.15
14d	0.75	1.13	1.73	1.85	0.11	0.21

Data are least squares means of 6 observations per treatment.
NC, antibiotic-free diet; PC, basal diet with avilamycin+salinomycin.
Means within the same row with no common superscripts differ significantly (p<0.05)