-> If I remember what I've read, the barn stays fairly warm compared to
-> outside because of the animals' body heat?
->
->    Relatively so, yes.  But - depending on how it's built, I suppose - the
-> water lines usually run danger of freezing nevertheless. Or, did in 
Germany.
Well around here we have to bury the water lines down about 4 feet to keep 
them
from freezing.  Then we use a hydrant valve in the barn.  A hydrant valve
actually shuts the water off way down at the 4 feet below ground level and 
lets
the water in the vertical section of pipe drain back out of it so it doesn't
freeze either.
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