Clinical and hematological parameters of calves in biogeochemical conditions of the Astrakhan region

The importance of trace elements in the nutrition of young farm animals is extremely high, since they participate in the regulation of basic physiological processes, and also serve as activators of enzymes of structural elements. In order to achieve good growth and development indicators of young cattle, it is necessary to optimize their mineral nutrition. In this regard, it is necessary to study the effect of certain mineral substances (Co, Se, I, Mn, Zn) in early postnatal ontogenesis on the clinical and hematological parameters of the body of calves.The research was carried out in 2021 on black-and-white cattle on the basis of the Department of Veterinary Medicine of Astrakhan State University. Determination of the levels of trace elements in the ecosystem was carried out in the Astrakhan region. In addition, 6 heads of black-and-white cattle were selected. Samples for the study were taken from animals aged from 1 to 6 months. Determination of hematological parameters of animals was carried out on the IDEXX Laser Cyte analyzer (USA), biochemical parameters – on the IDEXX Catalist analyzer (USA).The conducted studies have shown a low level of some trace elements in the ecosystem of the Astrakhan region. The greatest amount in soil and plants contains manganese and zinc, the least – selenium. However, the lack of certain minerals in early postnatal ontogenesis does not affect the hematological parameters of the calves' body. All the studied parameters were within the limits of physiological norms, which may be associated with the long-term pathogenesis of microelementoses in animals.