Supplementation of dairy cows grazing an alpine pasture: Effect of concentrate level on milk production, body condition and rennet coagulation properties Stefano Bovolenta, Walter Ventura, Edi Piasentier and Franco MalossiniAnn. Zootech., 47 3 (1998) 169-178DOI: https://doi.org/10.1051/animres:19980302