Feed passes from the gizzard into the small intestine , where additional enzymes are added and digestion occurs. The small intestine also serves to absorb digestion products (proteins, carbohydrates, and fats). You should notice in the photo above that the first part of the small intestine loops around the pancreas (called the duodenal loop). The pancreas secretes digestive enzymes into the small intestine. The small intestine of a mature chicken is more than feet in length, which is necessary to provide the surface area required to absorb digested feed.