Hi
We put a round feed ring in the shed in the winter - the sort for a large round bale. The cattle are fed hay ad-lib & they don't get too fat - at the moment the 15 are getting through a bale every 2-3 days, though they are still taking themselves outside. They only stay in when it's too thick with snow to see any green stuff.
They don't all feed at once, there is a 'eating order', but everyone does get their fill.
Sue