[Evaluation of diagnostic methods of Streptococcus agalactiae intramammary infections in dairy cattle]

analyse microbiologique bovine mastitis cell counting cow milk dairy cows diagnosi diagnosis diagnostic disease surveys encuestas sanitarias indagini sulle malattie lait de vache latte di vacca leche de vaca mammite bovine mastite bovina microbiological analysis servicios veterinarios servizi veterinari streptococcus agalactiae vacas lecheras veterinary services