The birds fed the enzyme supplemented diets had heavier and larger duodenums and larger overall size and weight of their small intestines than those of birds fed enzyme unsupplemented diets. This was possibly due to the fact that the enzymes accelerated the process of digestion in the digestive tract, particularly in the gizzard. The quantity of digesta in the duodenum was greater in the birds fed the enzyme supplemented diets than in the birds fed enzyme unsupplemented diets. This become evident in the first two weeks when gizzard weights of birds fed the enzyme supplemented diets were smaller than those of birds fed the enzyme unsupplemented diets (Table 6). The relative gizzard weight of birds fed the enzyme supplemented diets were also significantly lower (2.65 v 3.02) in week two. This indicates that the gizzards of birds may have worked harder and therefore increased their development in the birds fed the diets without enzyme supplementation. In week six, the larger size of the duodenum and of the overall intestine of the birds fed the enzyme supplemented diets have been due to the need to accommodate the higher volume of digesta from the gizzard such as appeared to occur with the fine ground diet (Table 5). Although the quantity of digesta in the duodenum and overall intestine of birds fed enzyme supplements was more than for the birds not fed enzyme supplements, the capacity of the duodenum to hold digesta was also greater.