In the present study an investigational work was performed to find out the effect of population density on the breeding of domesticated zebra finch. For the present experiment three different types of cages were used namely: type A, type B and type C cages. Type A cage was utilized for colonial breeding of zebra finch. Ten adult compatible pairs of zebra finches were kept in type A cage. Five type B cages were built for the study; two adult compatible pairs were kept in each type B cage. Ten type C cages were constructed for the present study; one adult compatible pair was released in each type C cage. In type A cage 5 pair produced eggs and only one pair hatched and reared chicks successfully. In type B cages none of the pairs produced eggs. In type C cages all pairs produced eggs, hatched eggs properly and reared chicks successfully.