  We argue that the dissipative transport in ferromagnetic quantum Hall effect
liquids at $\nu=2N+1$ is dominated by the thermal activation of pairs
consisting of an electron and an antiskyrmion (topological texture which
represents a hole with 'screened' exchange interaction), thus manifesting the
lack of electron-hole symmetry in quantum Hall ferromagnets. We find that the
activation energy of such a pair is not the exchange energy, but is determined
by the interplay between the excess Zeeman energy of a skyrmion and the
charging energy of its topological texture: $${\cal E}=a\epsilon_{{\rm
Z}}^{1/3}E_{{\rm C}}^{2/3}\ln ^{1/3}(\frac{\Im_{i}}{E_{{\rm
C}}^{2/3}\epsilon_{{\rm Z}}^{1/3}}), E_{{\rm C}}=\frac{e^{2}}{\chi \lambda}, $$
with $ a\approx 1.75$.
