Epidemiology of Bovine Brucellosis in Dairy Cattle in Northern Iran

Brucellosis is a bacterial infectious disease in animals and humans and is caused by Brucella, spp. In this survey, the Brucella infection rate was studied in dairy cattle of industrial and non-industrial herds in Mazandaran province. One thousand one hundred and fifty-two milk specimens were randomly collected (384 samples per county and per month of study, According to Morgan table) from cows in the area. It must be indicated that 576 samples of milk samples were taken from dairy cows on industrial farms and 576 samples of them from dairy cows of traditional herds. The specimens were collected from 3 regions in this province. The milk ring test was done on milk samples. The results showed that Brucella infection in the province was 2.77% for industri al farms, 9.02% for non-industrial herds and 5.9% for total cows of the province (68 Reactor of 1152 samples). The results of months of the study did not show significant differences in the rate of disease, on traditional cattle and industrial cattle. Also significant difference in incidence was not observed in different geographic areas. But the increase in the prevalence of Brucellosis in traditional cattle than cows in the industrial farms was significant (P <0.05).