The studies covered 1 247 half-bred horses of various coat colour, for which polymorphisms of albumin, transferrin, alkaline esterase, vitamin D-binding protein, and A1B glycoprotein were determined. In order to characterise the genetic structure of the studied population, phenotypic and allelic frequencies of blood protein systems, observed and expected distribution of phenotypes, as well as frequencies of homozygotes and heterozygotes in the analysed protein systems were determined in relation to the horses’ coat colour. Variability was found in blood protein genetic polymorphism in relation to coat colour.

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