[1] INRA, Herbivores UMR1213, F-63122 St Genes Champanelle, France
[2] Clermont Univ, VetAgro Sup, UMR Herbivores, BP 10448, F-63000 Clermont Ferrand, France
[3] InVivo Nutr & Sante Anim, F-56250 Talhouet, Saint Nolff, France
[4] INZO, Rue Eglise,CS90019, F-02402 Chierry, Chateau Thierry, France