I have a hanging feeder in my run, I have 19 chickens...they have access to feed 24/7...I let them out in the AM, throw them some scratch to start the day, and off they go, they free range, all day...around 6pm, I run out with whatever I have, lettuce, apples, squash, raspberries etc...that is their treat...and in the coop they go by 7:30 (that will be earlier soon with the dark of winter fast approaching)...
I have heard that corn is better for them in the winter to help them retain heat...it fills them up, and as long as the animal is full, they are warm...
(my rancher hubby told me this, as I shuddered every time I saw our cattle braving the bitter cold..."they are fine, they have feed, they are warm" )
He laughs when I cook oatmeal for them in the cold of winter...they DEVOUR it....
Do yours get to free range? Mine run and flap all over the place, so they burn off a lot of what they consume...they need exercise daily...and yes, they prefer fresh veggies etc to their dry feed...!