There is little experimental data about mammalian IRAK2 mediated signaling. It is possible that phosphorylated IRAK2, like IRAK1, dissociates from upstream adapters such as MyD88 but leaves its interaction with the downstream adapter TRAF6 unaffected. Furthermore Keating et al.  showed that IRAK2 can promote TRAF6 ubiquitination. Other studies [Wan et al 2009] detected IRAK2-TRAF6 interaction upon LPS stimulation.
In this reaction we assume that chicken IRAK2 behaves like its mammalian homolog IRAK2.