Epizootic situation of eimeriosis in broiler chickens under litterless and litter-based rearing systems

The purpose of the research is to study the epizootic situation of eimeriosis in broiler chickens with litterless and littercontaining technologies of their rearing at a broiler farm by age and season of the year with modern complex bioprotection against eimeriosis of broiler chickens with disinfection of premises and equipment with a test agent containing 1.0% glutaraldehyde, 7.0% glyoxal, a mixture of QAC (Quaternary Ammonium Compounds) 25.0%. Materials and methods. The epizootic situation with Eimeria spp. infection in broiler chickens was also studied. The study was conducted at a poultry farm in the Northwestern Federal District of Russia using litterless and litter-based broiler chicken rearing technologies. Eimeria infection in broiler chickens was studied using the Fulleborn and Darling coproscopy methods (GOST 25383–82), in different seasons of the year by examining up to 20 droppings samples for each rearing technology for chickens of the following age groups: 10–11; 21–22 and 35 days. At the end of technological cycles in litterless and littered systems of growing broiler chickens, the infection of young broiler chickens with Eimeria spp. was studied in the most critical periods in terms of biosecurity: in winter – from January to February; in spring – from March to April and in the autumn-winter period October-December in 2024–2025. In the course of the work, the extensive infection (EI) and intensity infection (II) of Eimeria spp . in chickens of different ages, the intensity efficacy and economic efficiency per 1 ruble of the costs of the applied disinfection with the studied preparation with a special agent containing glutaraldehyde 1.0%, glyoxal 7.0%, a mixture of quaternary ammonium compounds 25.0% in a 5.0% concentration during a sanitary break and the prescription of the coccidiostatic agent salinomycin 12.0%. Along with the above, nematodes and arthropods (if present) were considered. Results and discussion. On a poultry farm with litterless rearing technology, the EI of coccidia by Emeria spp . was significantly lower in the first three weeks of life of broiler chickens at different times of the year, remaining at 20.0% and 35.0%, respectively. By 35 days of age, the EI of Emeria spp. in houses with litter and litterless rearing technologies increased to 65.0–70.0% and 100%, respectively. The II also increased in both groups during the first observation period in winter and spring, reaching 3.3–17.7 thousand and 3.1–7.8 thousand Emeria spp. per gram of feces. During the second stage of observations in the autumn and winter periods of 2024–2025, the intensity infection with the litterless rearing technology was the lowest throughout the entire period of broiler rearing and amounted to 2.6–4.3 thousand Emeria spp. oocysts per gram of feces in the first 3 weeks of life and an average of 10.8 thousand specimens at 35 days. The II was determined to be low in the second stage of the research.