Doença respiratória em bovinos criados extensivamente

Abstract

Bovine respiratory disease (BRD) is a syndrome that affects cattle and can have a variety of etiologies. The present study presents a review of the literature on this disease, focusing on clinics, laboratories and ultrasounds, as tools to aid the diagnosis of BRD and viable to be carried out in the field. Furthermore, the present study objective to describes clinical, hematological, ultrasonographic, microbiological and histopathological findings of an outbreak of BRD in extensively reared elite Nellore calves. In these animals, based on clinical results and plasma fibrinogen values, eight animals (21.6%) from a batch of 37 calves were selected to undergo thoracic ultrasound. Of these cattle, seven (87.5%) presented images compatible with DRB. The ultrasound findings of these animals showed a significant difference (p = 0.0041) in animals with hyperfibrinogenemia (828.6 ± 372.9 mg/dL) when compared to animals with normal fibrinogen values (513.3 ± 208.0 mg/dL). The results reinforce the importance of combining different diagnostic techniques in the detection of DRB, in addition to indicating the potential for using plasma fibrinogen as a biological marker for the selection of animals in which thoracic ultrasound is indicated.