Our 25 hens are free-ranging on "pasture". We fence them in a large yard to keep them out of our vegetable gardens and to protect them from coyotes and hawks (we cover their yard) which are actively seeking prey where we live. Our hens have access to a hen house all day--a decidedly non-mobile...
I agree with a lot of the reasons for not over-reacting to lists about toxic vegetables for chickens. We give our chickens the "Grade C" produce from the garden, which includes everything--cabbage too. It's supplemental to their feed--or maybe their feed is supplemental to the produce whenever...