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The aim of the study was to determine the performance of four Polish breeds of goats and to evaluate the impact of αs1 -casein genetic variants on milk, fat, protein yields and casein content. The investigations included a total of 598 goats of four breeds, i.e. white improved, colour improved, white non-improved and colour non-improved. Goat productivity was established in relation to milk yield,...
Casein is the predominant protein in milk of almost all mammalian species. The goat casein fractions (αₛ₁-, β-, αₛ₂-, κ-casein) are coded by the single autosomal genes CSN1S1, CSN2, CSN1S2, and CSN3, which cluster in a DNA segment of about 250 kbp, mapped to chromosome 6. All casein fractions are characterized by high variability. At the four loci, “normal” alleles are associated with a normal or...
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