Management and productive aspects of a dairy herd in a Valle d´Aosta alpine pasture

alpine grasslands ash content bilancio energetico conteggio delle cellule somatiche contenido de ceniza contenido de materia seca crude fibre crude protein dairy cows dry matter content energy balance fibra bruta fibra grezza fibre brute gestione del bestiame grasa de la leche grasso del latte grazing lactosa lactose lattosio livestock management manejo del ganado milk fat milk protein milk yield pascolamento pascoli pascoli alpini pastizales pastoreo pastures praderas alpinas prairie alpine proteina bruta proteina grezza proteine del latte rendement laitier rendimiento lechero somatic cell count teneur en cendres vacas lecheras vacche lattifere val d'aoste valle d'aosta valle de aosta valle d´aosta