COMPARISON OF MORPHOLOGICAL CHANGES IN THE BLOOD OF HENS DURING EXPERIMENTAL INFECTION WITH T. SPIRALIS AND T. PSEUDOSPIRALIS

A comparison was done for changes in the morphological composition of blood in hens experimentally infected with T. pseudospiralis and T. spiralis larvae at a dose of 2 larvae/g m.a., intragastrically. It was established that trichinellosis in the hens due to the parasitism of a non-encapsulated Trichinella species caused regenerative hypochromic anemia. Indicators of the trichinellosis process are granulocytic series cells, heterophils. The onset of the body's reaction to infection was detected on day 4 after invasion and was expressed by mild neutrophilia. Then an increase was observed in the content of heterophils in the blood of the birds with a maximum on day 29, which corresponds to the migration and muscular stage of the trichinellosis process. Subsequently, there is a relative and absolute quantitative decrease in these groups of cells in the bloodstream of the poultry, however, these indicators are higher during the entire observation period (61 days) than in the hens of the control group. Lymphocytes in the blood samples from the experimental hens have an absolute increase on day 50 from the infection, which can be characterized as an immunological reaction of the hens in the invasion. The dynamics of the level of eosinophils and basophils circulating in the blood of the poultry is due to the stages of the trichinellosis process and confirms the predominance of an allergic reaction in the nature of the disease. However, more pronounced quantitative changes in hematological parameters, especially on the part of heterophils and eosinophils were recorded in the poultry infected with a non-encapsulated Trichinella species.