The effects of energy source and level of digestible undegradable protein in concentrates on silage intake and performance of lactating dairy cows offered a range of grass silages

alimentation bovin bovin laitier cattle chemical composition composition chimique concentrates cows dairy cattle degradation digestibilidad digestibility energy sources ensilado ensilage (produit) feed grasses feed intake feeding food intake ganado bovino ganado de leche lait leche milk milk yield piensos concentrados prise alimentaire (animaux) prise alimentaire (homme) proteine proteins rendement laitier rendimiento lechero silage vaca vache