i pretty much assumed that since chickens were not mammals they would require different bacteria to help in digesting
chickens are omnivores, but do not use saliva to begin the break down of starch, instead they use the grit in the gizzard/crop. so i would think the bacteria for a chicken gut would have to be even MORE efficient than what us humans have. but this is also why chickens are not meant to be corn fed, but fed a large variety of things. which is why free ranging is good for them.
even though cows tend to eat almost everything (learned about that when i asked what the giant magnets were in the feed store, its to keep nails and other metal from moving in their gut) the enzymes in their gut are for breaking down the cellulose in plants. that is why they can eat plants (they also use those 4 stomachs to move the fermenting greens back and forth between the gut, and why you see a cow suddenly chewing) and we cant. i really want to see that dirty jobs video where mike goes to the research place where they have those windows (that open) in the sides of the cows that accesses one of the cows stomachs to actually see how things are digested, and what live microbial activity is taking place.
and the funny part is i currently have a D in biology right now.... but that is cos they are starting at the beginning of how all critters evolved. we are finally onto the worms, which were the first to start having compartment cavities. humans and earth worms are 3 layered critters. but the flat worm is 2 layered and the sponge is the only one with no layers.