As for the whey proteins, at β -LG locus we identified three genotypes (AA, AB and BB), the highest frequency being calculated for β - LG AB (0.44), while in system α -LA there is monomorphism for allele α -LA B.Fault tolerance in the Tricon is achieved by means of a Triple-Modular Redundant (TMR) architecture. K-CN AB gen otype recorded the highest frequency (0.69). For the K- CN locus, three genotypes were observed: AA, AB and BB. For αS2 -CN system only one genotype was identified - AA, αS2 -CN A allele having a frequency of 1.00. For β -CN locus A1A2 şi A2A2 genotypes recorded the highest frequen cies (0.26 for both genotypes), while the β -CN A2C and BB had very low frequencies (0.03 each). T he αS1 -CN BB genotype recorded the highest frequency (0.94),while the C allele recorde d a low frequency (0.03). At αS1 - CN locus, two genotypes were observed: BB and BC. Based on our research, we identified commo n genetic variants for the six loci coding the major milk proteins: alpha- casein S1 (αS1 -CN) beta- casein (β -CN) alpha- casein S2 (αS2 - CN) kappa-casein (K-CN) beta- lactoglobulin (β -LG) and alpha- lactalbumin (α - LA). The aim of the current paper is to identify the gen otypes and to calculate genotype and allele frequencies for a nucleus of Holstein-Friesi an cows exploited in the North-East of Romania. These proteins have a large number of genetic variants, some of these being correlated with milk composition and milk production traits. In cattle milk are six major proteins divided in casein fraction and whey fraction. Knowing the genotypes of dairy cattle and the positive associations between the genetic v ariants and production traits, helps the farmers to keep in their batch only the valuable an imals. Dairy farmers are nowadays adopting the molecular p rofiling in order to get some useful information for accelerating the selection p rocess.
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