Sulfate of streptomycin as a helper in leptospirosis treatment improving reproductive indexes in dairy herd

Abstract

The aim of this study was to report the results of a treatment with sulfate of streptomycin in a dairy herd with positive serology for leptospirosis. Sixty animals were analyzed with clinical signs of rut repetition, irregular rut and abortions, and blood was collected to laboratory diagnosis. The used technique was microscopic serum agglutination-test (MAT) with two evaluations made in an interval of six months. In the first serological evaluation 50 animals (83,33%) were diagnosed positive (serovar hardjo), and in the second 53 animals (88,33%) had positive results (L. hardjo, L. icterohaemorrhagiae and L. grippotyphosa). Between these two evaluations all herd was treated with Sulfate of Streptomycin, in a single dose of 25 mg kg-1, and enrolled in a vaccination program. Ten months after the begining of the evaluations and treatment it was done a last visit to the property where favorable reproductive indexes to the Brazilian livestock production. Based on these results we conclude that the Leptospirosis is an emergent disease in the state of Rio Grande do Sul causing great damages due to the reproductive flaws caused by the infection and that the use of sulfate of streptomycin , in a single dose of 25 mg kg-1 is efficient for control of the disease, as well as the association of a vaccination program. Keywords: Leptospirosis, sulfate of streptomycin, dairy herd, reproductive indexes.