The Collaborative International Dictionary of English v.0.48:

avianise \avianise\, avianize \avianize\v.
   1. to modify microorganisms by repeated culture in the
      developing chick embryo.
      [WordNet 1.5]

WordNet (r) 3.0 (2006):

avianize
    v 1: to modify microorganisms by repeated culture in the
         developing chick embryo [syn: avianize, avianise]