Rogez C a , Clayette P a , Martin M a , Dereuddre-Bosquet N a , Martal J b , Dormont D c . a CEA, DRM, Fontenay-aux-Roses, France , b INRA, Physiologie Animale, Jouy-en-Josas, France , c CEA, CRSSA, EPHE, DRM, Fontenay-aux-Roses, France Background: