For chickens I would definitely do the Illinois everberring mulberry....thats going to be your biggest crop. They produce crops of berries throughout the summer...chickens love them....also I would include raspberries, blackberries, goumi's, bush cherries, currants, gooseberries, highbush blueberries, and cranberry bush viburnums (chickens might not reach), elderberry (again chickens might not reach
fruit), seabuckthorn (not sure if chickens will eat these but
people can). These are all bushes that
should not shade each other out as they grow; the mulberry is an exception but that is a must have for chickens and people.