  Starting from the old idea that Fermi statistics for quarks play a
fundamental role to explain some features of hadron structure, we study the
modification of the scaling behaviour of parton distributions due to quantum
statistical effects. In particular, by following an interesting formal analogy
which holds between the Altarelli-Parisi evolution equations, in leading-log
approximation, and a set of Boltzmann equations, we generalize the evolution
equations to take into account Pauli exclusion principle and gluon induced
emission.
