Chemical composition and in vitro digestibility of stalks, leaves and cobs of four corn hybrids at different phonological stages

contenido de materia seca contenuto di sostanza secca crude fibre crude protein digeribilità digestibilidad digestibility dry matter content fenologia feuille fibra bruta fibra grezza fibre brute foglie grain granella granos hojas hybride hybrids ibridi in vitro experimentation leaves lignina ligninas lignine lignins mais maize maturation maturazione biologica phenology proteina bruta proteina grezza sperimentazione in vitro zea mays