Abstract

The sera coming from 450 dairy cows have been analyzed for the detection of brucellosis. The rate of prevalence of the infection is 10.44%. The test of the Intradermotuberculination for the detection of tuberculosis showed that the rate of prevalence of the infection is 08.22%, with a significant difference (p < 0.05) between the individuals of 2 years and those of more than 4 years. All studied sanitary troubles were present for a whole year, with a predominance of mastitis, especially in the beginning of spring where the prevalence attained 44.88%, and/or reproduction unrest was 14.88%. Respiratory trouble especially appeared in winter, with a peak of 21.77%. Digestive troubles were at the rate of 11.11% in spring, whereas parasitosis and piroplasmosis reached a maximum of 21.55% in summer. Locomotive troubles were constantly present all through the year in the practically same beasts  with an estimated peak of 18.22% in winter, which showed that the season has an effect on the emergence of these different troubles with a valour of high significance (p < 0.001).

Key words: Tuberculosis, brucellosis, bovine mastitis, reproduction disorders, respiratory disorders, digestive disorders, piroplasmosis, lameness, seasonal prevalence, primary disease, North-eastern Algeria.