Med. Weter. 69 (11), 666-669, 2013
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| Strza?kowska N., Markiewicz-K?szycka M., Bagnicka E., Po?awska E., Krzy?ewski J. |
| Influence of polymorphism of casein proteins on chemical composition and technological properties of goat?s milk |
| Casein is the predominant protein in milk of almost all mammalian species. The goat casein fractions (?S1-, ?-, ?S2 -, ?-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 high casein fraction content, whereas ?defective? alleles are associated with a medium, low, or zero content of casein fraction in milk. The quality of total casein and, in particular, the calcium-sensitive fraction (?S1-, ?-, ?S2) significantly affects the chemical, physical, technological, and nutritional quality of goat?s milk. |
| Key words: goat, casein, protein, milk |