This scientific research study studied the age-related epizootological characteristics of colibacillosis in lambs. The studies were conducted on large sheep farms in Samarkand, Surkhandarya and Navoi regions, and the dynamics of the spread of the disease by age were analyzed. The results showed that colibacillosis is most common in the first 15 days of lambs' life, and this period is considered the epizootic peak of the disease. In the period of 15–30 days, the incidence rate decreased by 2–7 times, which is explained by the formation of acquired immunity in lambs. The highest incidence of the disease by region was recorded in Surkhandarya (78.46%), Navoi (61.41%) and Samarkand (57.69%). The results of the study scientifically confirmed the high susceptibility of lambs to the disease in the first two weeks of life, weak immunity and the importance of sanitary and hygienic conditions.  These results will serve to improve disease prevention strategies by identifying age-specific patterns of colibacillosis spread.

lambs, colibacillosis, age factor, epizootological characteristics, E. coli, distribution dynamics, immunity, sanitary and hygienic conditions, epizootic risk period, prevention.

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