goat breeds

Study of the genetic polymorphism of goat ca-sein genes (αS1-, β-, αS2- and κ-casein) has aroused a considerable research interest because goat casein polymorphisms are related to dairy performance. These genes significantly affect the chemical, physi-cal, technological and nutritional quality of goat’s milk (Martin et al., 2002). CSN1S1 (casein alpha-S1) is the main calcium-sensitive casein in ruminant milk, distinguished by high qualitative and quantitative genetic variation. The goat CSN1S1 gene is an excellent example for demonstrating that a major proportion of the variabil-ity observed in the casein alpha-S1 content of goat’s milk is due to the presence of autosomal alleles at a single structural level locus. So far at least 17 allele