It's a tough thing we have to deal with up here in the high country. We lose them as babies usually if they have some sort of illness at a young age. Showstopper, no need to worry about Fu at low elevations. Only thing I'd add to the CSU article is the higher the animal is PAP tested the more accurate the test. Tests taken under 6,000 ft elevation are not near as accurate as those taken over that. For anyone looking for true high altitude cattle PM me I've got a pile for sale this November. Neighbor who I work closely with is having a large bred female sale.