Noinfectious diseases in industrial poultry farming: histological diagnostics

Abstract

Under conditions of egg and poultry farming noninfectious diseases are widespread and cause significant economic damage. These diseases can be caused by a variety of etiological factors: the deficiency of the necessary chemical elements, substances or their combination, excessive amount of certain classes of organic substances in feed. Diseases of complex etiology are also recorded, which arise from a combination of unfavorable factors and anatomical and physiological properties of individual bird crosses. Under the influence of unfavorable factors in various organ systems, pathological processes of various nature (dystrophic, necrotic, inflammatory) arise. In this case, the symptoms and pathological changes can be either similar or poorly visible macroscopically. In this regard, the results of histological examination of organs and tissues play an important role in making a presumptive diagnosis. The article introduces the original results of researches on pathomorphological diagnosis of the most widespread diseases in industrial poultry farming of noninfectious etiology: chronic feed borne toxicoses (including mycotoxicoses), hypovitaminosis A, hyposelenosis, amyloidosis, necrosis of the femoral head. The results of examination of spontaneous material stuff. The findings are formulated in the form of histological diagnoses. The attention is focused on the main (pathognomonical) signs of a great value for differential diagnostics of this group of diseases. Various variants of pathomorphological course of the diseases running both in a classical way, and in the form of a pathomorphosis (the variated pathoanatomical and histological lesions against application of vaccines and antibiotics) are considered.