Degradation in the rumen of proteins from fresh lucerne forage in various stages of growth and conserved as silage or hay Jocelyne Aufrère, Dominique Graviou, René Baumont, Aline Detour and Camille Demarquilly Ann. Zootech., 49 6 (2000) 461-474 DOI: 10.1051/animres:2000136