Detecção de anticorpos e fatores de risco associados ao vírus da Diarreia Viral Bovina (BVDV) em bovinos leiteiros no centro-leste maranhense - Brasil

Abstract

The Codo Regional Unit located in the east-central state of Maranhao, has great potential for the development of modern dairy farming, for having, in addition to extensive land area, topography and favorable climate, with little exposed to periodic climatic instability. The bovine viral diarrhea virus - BVDV - is one of the most significant pathogens of cattle and causes large economic losses to the livestock industry worldwide (Baker 1995). The present study aimed to estimate the frequency of cattle reagents to bovine Diral Diarrhea virus - BVDV in dairy herds of Regional Codo - MA as well as the risk factors associated with infection. By indirect ELISA test, 396 serum samples derived from 33 cattle herds belonging to municipalities of Codo, Timbiras, Coroata, Peritoro and Alto Alegre were analyzed. Herds tested, was found a percentage of 90 % (n=30) reagent percentage. The municipality of Codo had the lowest frequency, 70% (n = 07), while in other municipalities, at least one animal which tested positive. Of the 396 samples analyzed, 54.04% (n = 214) were positive, 3.79% (n = 15) suspected and 42.17% (n = 167) were negative. The frequencies of serologically reactive to BVDV cattle were 34.17% (n = 41) in Codo, 52.78 (n = 19) in Timbiras, 55.95% (n = 47) in Coroata, 83.33 (n = 60) in Peritoro e and 55.95% (n = 47) in Alto Alegre. he results obtained in this study showed that BVDV is widely distributed in herds of regional Codo and that, statistically, among the risk factors evaluated, only the age of the animals was associated with virus infection.