Johnny has said before on countdown shows he shaves he beard after he wins. Then he starts to let it grow again the start of training camp.
this is what I was going to write.
his wife hates the beard, so he shaves it between fights.
Fedor, Mir, Lytle, Serra, Hendo, Chuck, Minowaman, Maynard, Forrest, Hunt
Pickett, Cerrone, Matt Brown, Bisping, Weidman, Barnett, Lawler