We're using a new system for calving this year: leaving the calves on their mothers. The normal approach is to remove new born calves to a shed, teach them to drink from a rubber teat and feed them milk. That's not nice for the cows or the calves and its a lot of work for us too.
Natural calf rearing is working out well so far (40 cows in milk). Most of the calves come up to the shed at milking time with their mums and hang out in the yard during milking, after which they all wander back to the paddock.
The calf shed hasn't been used so far - the calves have used the shelter belts in stormy weather.