Rupture of the mammary vein in a Holstein cow with mastitis and udder edema: case report oleh Michel josé Sales Abdalla Helayel, Adriano Tony Ramos, Samara de Paula Lopes, Isabelle Magalhães Cunha, Paulo César A. Ribeiro Silva, Robson Pacheco R. Moutinho, Vivian Assunção Nogueira Carvalho, Saulo Andrade Caldas