Paratuberculosis epidemiological study (risk factors and prevalence) in ovine livestock production units in the State of Guanajuato, Mexico

Abstract

In order to determine the prevalence and risk factors associated with paratuberculosis in ovine livestock production units in Guanajuato, Mexico; a cross-sectional epidemiological study was carried out for one year long. Serum samples (n = 1387) were analyzed with an agar gel immunodiffusion test. Bacteriological culture and IS900 nested PCR were done from the fecal samples (n=640). For epidemiological data, two questionnaires (individual animal and LPU) were filled out and statistical analysis was done with STATA 7 ® software. Ovine paratuberculosis prevalence in the studied population was 4.54%; in ovine older than 11 to 24 months age was 3.52%; females with more than three parturitions showed 6.5% prevalence; and in the livestock production units that carried mucking out and elimination of feces only once a month the prevalence was 50%. Odds-ratio analysis (OR) showed that the presence of thin females after parturition had an OR of 3, females with more than 3 parturitions had an OR of 4.74, while livestock production units that mucked out and eliminated feces once a month had OR of 1.41. Results in this study showed the degree of spread of paratuberculosis among sheep throughout various zones in the State of Guanajuato. Comprehensive ovine paratuberculosis epidemiological studies shall be a tangible asset that will allow the design of appropriate control programs for the elimination of the disease in livestock production units. Key words: Ovines, paratuberculosis, risk factors, prevalence, epidemiology