Prevalência e fatores de risco associados à infecção por Maedi-Visna em ovinos de raça definida no Estado do Maranhão, Brasil

Abstract

In order to determine the seroprevalence of maedi-visna (MV) and the risk factors associated with infection in sheep flocks breed of Maranhão, were investigated using the technique of IDGA, 445 animals of both sexes, different breeds and ages, 70 in group 1 (exposure), and 375 in group 2 (properties). Samples of group 1 were collected during the 57th Agricultural Exhibition of Maranhão (EXPOEMA), and group 2 Properties of meso Center, East and North Maranhão. It found an overall prevalence of MVV infection of 2.02% (9/445) and the prevalence of 1.42% (1/70) in group 1 and 2.13% (8/375) in group 2.Of the sampled counties, 40% (4/10) had at least one property with positive animal, and properties, 25% (4/16) had at least one positive animal, all located in the North Mesoregion, which showed a prevalence of 2.20 % (9/409). Regarding gender, we found that 1.15% (1/87) of males and 2.23% (8/358) of females were seropositive (p> 0.20). As to the breed, it was observed that 1.66% (2/120) Dorper; 1.67% (5/299) St. Agnes; 33.33% (1/3) White Dorper, and 4.34% (1/23) for the Texel breed, having been the only variable between all risk factors studied, with a significant association in the multivariate analysis (p<0.05). It was concluded that infection by MVV is present in sheep breed at Maranhão, which should serve as a warning for the prevention, control and eradication.