Всероссийский научно-исследовательский институт физиологии, биохимии и питания животных – филиал Федерального государственного бюджетного научного учреждения «Федеральный научный центр животноводства – ВИЖ имени академика Л.К. Эрнста»
ABSTRACT. The aim of the work was the study of the immune status in bull-sires of dairy and milk-meat breeds, depending on the age and country of origin. All animals were divided into two groups: I − young (n = 26, mean age 4 years) and II − adults (n = 8, mean age 9.6 years). In all animals in spring (April) and autumn (October) periods, blood samples were taken by jugular vein puncture to determine the concentration of immunoglobulin IgG and immunocompetent blood cells. The relative content of eosinophils in the blood in group I (P<0.05) and IgG concentration were higher (P<0.05) compared to group II. The study of seasonal changes in immunological indices revealed the presence of a significant negative correlation (P<0.05) in the autumn period in pairs of parameters: neutrophils − lymphocytes, lymphocytes − eosinophils, phagocytic activity of neutrophils and monocytes − eosinophils. The origin of animals had a certain effect on the indicators of immune status. The content of eosinophils in the group of bulls from the Netherlands was higher, compared to the bulls from Canada (P<0.05) and USA (P<0.05). In the values of phagocytic activity, a tendency to increased levels in the group of bulls from USA was revealed in comparison with animals from Canada, the Netherlands and Russia, but in general this indicator did not reach the lower limit of the normative levels. According to the authors, the data obtained give some guidelines for practice: 1) it is advisable to monitor the state of cellular and humoral immunity in bulls, including the evaluation of the correlation between parameters of leukoformula; 2) a similar study is recommended for early detection and elimination of risk factors that affect animal health, and for immunization activities to improve the viability of animals and their offspring.
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