Table 1. Incidence of major histological lesions of bursa of Fabricius.

Pathological Lesions	Time	Control group	AFB1 group
Vacuoles increased	7 days	0/6	3/6
	14 days	0/6	4/6
	21 days	0/6	6/6
Nuclear fragmentation increased	7 days	0/6	1/6
	14 days	0/6	4/6
	21 days	0/6	5/6

Incidence of lesions in the BF among animals from different experimental groups (n=6).