I got a couple of orange Taklon brushes at Wal-Mart in the artsy-craftsy department. They work better than any others I've found lately. I remember the camel hair brushes shedding a hair or two way back, no matter what I tried to stop it.
The Taklon brush lost a few bristles at first, but that seems to have stopped.
I tried some white bristle and black bristle, I think they might be hog hair. They seem coarse, and lose little bits, not full bristles. It's almost like 1/8" of bristle breaks off for no apparent reason.
By the way, foam brushes don't work. They swell up like a tick in just a minute or two.