I separate ram and wether from the full ewes during lambing, then pop them back into the same field when the lambs are a few weeks old. All are within sight of each other. I do it so the boys have somewhere to shelter if the weather turns bad (so they don't try to get into the shelter with any full ewes or ewes with lambs at foot).
But that's because of my setup, might be different if I had one huge barn for them all.