The Average Values and Phenotypical Correlations of the Qualitative Milk Parameters in Carpathian Goat Breed, Estimated Function of Genotypes from the αS1 – casein Locus

Abstract

The content of I± S1 – casein in goat milk varies in wide limits from an individual to another (0 - 7.2 g/L) due to the complex genetic polymorphism of this protein. Between the 18 genetic variants (alleles) there are big differences concerning the expression level of this protein in milk (Grosclaude et. al., 1987; Mahe et. al. 1994; Caroli et. al. 2006). The aim of this paper was to report the average values and phenotypical correlations of the qualitative parameters of goat milk (the content of fat, protein, casein, lactose, unfatty dry matter) function of genotypes identified at I± S1 – casein locus by the isoelectric focusing technique (IEF). The average values of the analyzed parameters are different function of genotype, the biggest values being recorded in homozygous AA genotype, and the smallest in the homozygous FF genotype. The most numerous positive correlations, intense and significant between the qualitative milk parameters are recorded in homozygous AA genotype. In conclusion, allele A from the CSN1S1 locus, which codifies I± S1 – casein in goat has advantages in genetic markers assisted selection (MAS).