Erythrocyte parameters of black-and-white cows of different ecogenesis in Western Siberia

The aim of the study is to evaluate the content and intrabreed variability of erythrocyte hemogram pa-rameters in Black-and-White cows of different ecogenesis in Western Siberia. Objectives: quantitative de-termination of erythrocyte parameters, study of their variability, analysis of intergroup differences and the strength of the influence of the ecogenesis factor on the level of the studied parameters in Black-and-White cows: purebred, Irmensky and Priobsky types. The content of erythrocyte hemogram parameters was studied in Black-and-White cows of different ecogenesis bred in the Novosibirsk, Kemerovo, Omsk Regions and the Altai Region. Studies of the absolute number of erythrocytes, hemoglobin, hematocrit, erythrocyte indices and erythrocyte sedimentation rate were carried out on a PCE-90VET hematology ana-lyzer on animals of the 2nd lactation with a productivity of 8–9 thousand kg. The average values of hema-tological parameters of cattle in the studied groups were within the generally accepted physiological norm. Purebred animals are characterized by the highest values of the indicators and phenotypic variability, intrabreed types are distinguished by a smaller range of biological variation, which reflects both the direc-tion of selection in the creation of production types and the adaptation of animals to specific environmental conditions. Analysis of erythrocyte parameters showed the presence of statistically significant (p < 0.05) differences between the groups for all indicators except the mean erythrocyte volume MCV. The strength of the influence of the ecogenesis factor (η2) for erythrocyte indicators varies from 13 to 52 %. The greatest strength of influence was established for MCH (mean hemoglobin content in erythrocytes) and ESR, the least – for HCT (hematocrit).