Table 4.

Effect of quercetin on immune organs in Arbor Acre broilers.¹

	Quercetin				SEM	P-value
Items	0	0.02%	0.04%	0.06%
Spleen index (%)2	0.93b	0.93b	1.06a,b	1.17a	.0184	0.008
Thymus index (%)3	2.34b	2.62a,b	2.96a,b	3.28a	.0755	0.016
Bursa of fabricius index (%)4	1.14	0.98	1.27	1.41	.0541	0.117

¹Data are means of 6 replicates per treatment.

²Spleen index = spleen weight/broiler weight × 100.

³Thymus index = thymus weight/broiler weight × 100.

⁴Bursa of fabricius index = bursa of fabricius weight/broiler weight × 100.

^a,bMean values within the same row sharing a common superscript letter differ significantly (P < 0.05).