Agentes associados, aspectos clínicos e controle da otite parasitária em bovinos da raça Gir

Abstract

The bovine parasitic otitis, a very common disease in Gir cattle, affects the performance of animals and it leads to a large losses to farmers. Despite the negative factors involved, until now the research have been not sufficient to resolve issues such as the prevention of parasitosis and treatment of affected animals. This study was conducted in three distinct phases: the initial objective was to identify the nematoides specimens associated with otitis parasitic in Gir cattle from two farms in the state of Minas Gerais. The technique of DNA barcode for identification and the conventional molecular taxonomic analysis were used. Second, it has been studied the microbiological profile of the external ear canal bovine oh the cattle, which it was divided into two groups: with and without clinical signs of parasitic otitis. Finally, it was evaluated the efficiency of a protocol control of nematodes and mites of the genus Raillietia, found in naturally infected animals with symptoms of ear infections. In the analyzed populations species Metarhabditis Blumi were identified through molecular analysis. Similarly, nematodes of the species M. Costai and M. Freitasi have been found through taxonomic analysis. Gram-negative bacteria were the most prevalent in the samples of the two groups with otitis (COP) and without otitis (PCOS). There was a large number of bacteria resistant to antibiotics used in the sensitivitytest conducted on samples collected in both groups of animals. The parasitic otitis control protocol was not sufficient to eliminate nematode infections. However, this protocol was able to significantly decrease the number of parasitized by ear mite without, however, eliminate the infection. These results allowed to increase the knowledge of otitis parasite in cattle and to 2 contribute to the practical application of theoretical and scientific knowledge in the daily practice of cattle farmers Gir.