When its raining heavily or the ground is deep in snow, I keep the hay racks permenantly full. When the weather is pleasant then they get hay morning and afternoon as they also have loads of graze/browse to keep them going.
when milking, Vanna gets about 1.5 lbs morning and night, the wethers get a handful just to keep them quiet and the other nanny gets whatever she needs (sliding scale depending on her condition score at the time)
we feed oats, beet, goat mix, mineral powder, they have access to red rockie licks and then they also have farming spares - sacks of spinich, cauliflower, brocolli etc that isn't going to sell.