Аналіз етіології некрозу голівки стегнової кістки у курчат-бройлерів за вирощування в промислових умовах

Abstract

Currently, increasing loads on birds bodies with intensive metabolism, adverse environmental factors, immunobiological adjustment during vaccinations leads to decreasing of nonspecific organism resistance and development of immunosuppressive states in the process of cultivation. Femoral head necrosis is a fairly common broiler disease. The causes of this disease can be both infectious and non-infectious. These factors often act as a complex of syndromes which starts with adversely affect on the individual in the hatchery egg, continues to affect during embryogenesis and has a negative effect during culturing. The purpose of the study was to determine the factors that cause broilers' necrosis of the femoral heads in industrial conditions. For this purpose, four batches of meat-type chickens eggs (in control trays) were examined in the poultry farm. Two batches of eggs were imported from abroad, and two were obtained from chickens of their own parent flock at 34 and 62 weeks of age. The conditions and shelf-life of hatching eggs in the farm met all the recommended parameters. The autopsy of incubation refuses after the first translucence of eggs from the chickens of their own parent flock indicated a weak thin shell. Further analysis and autopsy of incubation refuses identified problems with hatching eggs, which can be a provocative factor for current broilers disease. Postmortem examination of incubation refuses revealed the presence in all the batches of examined eggs a significant number of samples affected by opportunistic pathogenic microflora, particularly Escherichia coli microorganisms. Bacteriological impression occurred on different stages of embryogenesis and in different degrees of manifestation, pointing to both different sources of infection and the severity of the pathological process