My
experience with
chickens is that dock's one of few plants they totally ignore. Rushes too.
They definitely like dandelion, plantain, nettles and grass-especially seeding.
rosebay willow herb I'm unfamiliar with, but if
online chicken people are to be believed, it's a yes.
Chickens do seem very fond of leaves with high oxalic acid like rhubarb, so while I don't know about sorrel, I wouldn't be surprised.
Do you mean culinary, or a wild one like 'sheep sorrel'?
While it's not a weed as such, but grows like one and also high in oxalates: silverbeet.
The chickens I've met love it above all else, and it's worth growing extra around the place just for them. The best chicken-treat of all is seeding silverbeet.
From your plant list it sounds like the run area's quite wet . If it is and space is limited, I've found that chickens can turn it into a hideous bog impressively fast and you may need to extend your mulching plans...