Some epidemiological characteristics of disease caused by protozoa (H. meleagridis) in chicken raising in Phu Binh district, Thai Nguyen province and treatment measure

Abstract

A total of 549 suspected chickens of having blackhead disease at Phu Binh district, Thai Nguyen province were dissected for finding Histomonas meleagridis protozoa. As a result there were 203 chickens infected with the Histomonas meleagridis protozoa, accounting for 36.98%. In which, the infection rate of chicken raising in Tan Kim commune was highest (43.59%) and the lowest infection rate was in Ban Dat commune (22.45%). Chickens of all ages were infected with H. meleagridis protozoa, but the prevalence was highest in chickens at age group from 1 to 3 months old
(58.52%). Chickens raised in summer season suffered with the higher prevalence of H. meleagridis in comparison with chickens raised in other seasons. The chickens raised by semi-grazing method had the highest prevalence (46.05%), followed by free grazing method (37.28%) and the lowest
was chickens rearing in captive method (24.85%). The treatment efficacy for blackhead disease in
chickens of the two regimens reached 90 to 93.33%.