Nutritive value of on-farm common vetch-oat hays. II. Ruminal degradability of dry matter and crude protein Madiha Haj-Ayed, Javier González, Rafael Caballero and María Remedios AlvirAnn. Zootech., 49 5 (2000) 391-398DOI: https://doi.org/10.1051/animres:2000130