On Dairy farms
Historically, yes, all the cows had horns. Today, though, you can find brown Swiss cows with both horns and those that are polled.
The species name of a Brown Swiss is Bos primigenius taurus.
A Brown Swiss cow can live for 9 to 15 years.
A Brown Swiss is a milk cow. Therefore it gets the same type of feed that any productive, high-maintenance dairy cow needs: A TMR (Total Mixed Ration) of hay (alfalfa, timothy, clover, orchardgrass,...