I read somewhere once, Not sure where, that pumpkin was a good 'treat' to give your flock. That besides the fact they love it, its also helpful in getting rid of worms. I don't think my hens have worms but they definately have pumpkin!
I don't know what I'm 'suppose' to give but I just cooked up a small pie pumpkin that may have been a couple pounds. It wasn't very big. But they are it. Seeds and all. Today they are all pooping orange!