The chickens have a perch, with plenty of room for all 6 of them. But they always sleep on the cold concrete floor

I've stopped putting hay down there to encourage them up on to the perch but nothing.
Why do they not use the perch - any thoughts?
To start with, you should never use hay in the henhouse. Not only does it harbour mites but readily grows fungal spores which cause breathing problems.burek wrote:Every night our cockerel takes over the WHOLE of the lovely hay-padded nesting shelf in the hen house. I mean he really stretches himself right out! He makes sure there's no room for any chickens to even dare contemplate joining him up there. ANd he poops all over it too!
The chickens have a perch, with plenty of room for all 6 of them. But they always sleep on the cold concrete floorAnd end up with dirty bums from sitting in droppings!
I've stopped putting hay down there to encourage them up on to the perch but nothing.
Why do they not use the perch - any thoughts?