The article talks about the conducted research on the infection of calves with eimeriosis depending on the age and seasons of the year in livestock farms located in Khachmaz and Shabran regions of Guba-Khachmaz economic region, also Bilasuvar and Hajigabul regions of Shirvan-Salyan economic regions. During the researches were studied spread of eimeria parasitizing on calves in farms depending on the seasons and the age of the animals. Depending on the age eymeriosis infection were determined 33.3% in Khachmaz region, 25.0% in Shabran region, 15.2% in Bilasuvar region, and 21.2% in Hajigabul region. As a result of examinations carried out in calves according to the seasons of the year was found infection eimeria: 38.1% in spring, 9.5% in summer, 28.6% in autumn, 14.3% in winter in Khachmaz region; 27.8% in spring, 5.6% in summer, 16.7% in autumn, 11.1% in winter in Shabran region; 30.4% in spring, 4.3% in summer, 17.4% in autumn, 8.7% in winter in Bilasuvar region; 21.1% in spring, no infection in summer, 15.8% in autumn, 5.3% in winter in Hajigabul region. The presence of factors (temperature, moisture, oxygen) necessary to the development of Eimeria oocysts in spring and autumn has a positive, and the decrease in air temperaturse in winter has a negative effect on the development of Eimeria oocysts.
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