Chickens do fine on just good quality feed, water and exercise. It is us that want to see them get excited for treats (like ourselves).
My chickens are 12 and 14 weeks: 3 of them eat red grapes cut in half, but one needs to eat them cut in 1/4's. Your chickens should be tempted by sliced up red grapes. Also, room temp watermelon, not frozen. Dig up some small worms or buy them at the store, that will get them excited to see you.
Hope that helps,
Hugh
My chickens are 12 and 14 weeks: 3 of them eat red grapes cut in half, but one needs to eat them cut in 1/4's. Your chickens should be tempted by sliced up red grapes. Also, room temp watermelon, not frozen. Dig up some small worms or buy them at the store, that will get them excited to see you.
Hope that helps,
Hugh