Table 2.

Grouping of experimental animals and the treatment

Groups	Treatment
Phase I (Experimental rats in this phase were fed with the contaminated feed for three months)
A (Normal)	Normal control animals were fed with the uncontaminated feed
B (Nickel)	Animals in this group were fed with nickel contaminated feed for three months
C (Benzo [a] anthracene)	Animals in this group were fed with benzo (a) anthracene contaminated feed for three months
Phase II (Experimental rats in this phase were fed with the contaminated feed for three months)
A2 (Normal)	Normal control animals were fed with the uncontaminated feed
B2 (Nickel)	Animals in this group were fed with nickel contaminated feed for six months
C2 (Benzo [a] anthracene)	Animals in this group were fed with benzo (a) anthracene contaminated feed for six months