1. Graduated Program of Animal Science, State University of Maranhão, São Luís, Brazil.
2. Veterinary Teaching Hospital, State University of Maranhão, São Luís, Brazil.
3. Departament of Veterinary Medicine, State University of Maranhão, São Luís, Brazil.
4. Graduated Program of Animal Science, State University of Maranhão, São Luís, Brazil; Departament of Pathology, State University of Maranhão, São Luís, Brazil.
5. Graduated Program of Animal Science, State University of Maranhão, São Luís, Brazil; Departament of Veterinary Medicine, State University of Maranhão, São Luís, Brazil.