We all want to make sure our chickens are happy and healthy. Just like us humans, diet and nutrition are essential for the overall health of chickens. The following article focuses on the gastrointestinal (GI) tract of chickens and how best to keep our birds happy and healthy with respect to diet and nutrition. Gastrointestinal Tract of a Chicken From start to end, a chicken’s digestive tract is quite different than our own, though there are some analogous parts between our two species. The chicken picks up food with its beak and secretes saliva to help moisten the food.