Abstract
ABSTRACT The objectives of the present trial were to evaluate the reproductive parameters in a Holstein bovine herd affected by leptospirosis during the outbreak of abortion and stillborn fetus and treated with streptomycin sulfate. Animals were divided in 2 groups of 10 cows each: G1, treated with streptomycin sulfate 25 mg/kg/lw for 3 days by IM route; and; G2, untreated control. Serum samples were collected on the onset of abortions and after that every 15 or 30 days until completing 270 days. Samples were analyzed by means of MAT microscopic agglutination test that showed sera conversion to serovar Canicola with titers ranging from 100 to 51,200; 7/20 of the urine samples were positive for Leptospira spp. by PCR After streptomycin sulfate therapy, the outbreak ended and urine samples also got negative to PCR and no fetus samples were positive in either techniques. However, it did not influence the evolution in antibody titers of serological profiles in both groups, which got negative after around 200 days of the onset of symptoms. Although there was no significant difference of the frequency of pregnancy/AI and calving/pregnancy rates between treated and untreated groups (p > 0.05), reproductive rates were lower in the untreated group.
Highlights
Leptospirosis is characterized by cyclical dissemination of Leptospira spp. within species or groups of animals, where the acute infection affected, convalescent or carrier animal transmits it to susceptible one
The objectives of the present trial were to establish the serological profile post treatment with streptomycin sulfate in a bovine dairy herd during the onset of leptospirosis caused by Leptospira interrogans serovar Canicola and evaluate the reproductive performance
The most common sign of bovine leptospirosis is the fail on reproductive performance: abortion, stillbirth and weak calves
Summary
Leptospirosis is characterized by cyclical dissemination of Leptospira spp. within species or groups of animals, where the acute infection affected, convalescent or carrier animal transmits it to susceptible one. Any serovar may infect any animal species, but a limited number of serovars affects productive species in an incidental manner, leading to outbreaks of abortion, stillborn fetus and return to estrus (FAINE et al, 1999). The objectives of the present trial were to establish the serological profile post treatment with streptomycin sulfate in a bovine dairy herd during the onset of leptospirosis caused by Leptospira interrogans serovar Canicola and evaluate the reproductive performance
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
