الفهرس 
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Abstract
β- lactoglobulin (β-LG) and alpha lactalbumin (α-La) are the main proteins present in whey . Its polymorphic genes affect economical traits in cattle breeds . The present study aims to identify the phenotype , genotype and allelic frequency of both genes among local cattle breeds
and buffalo in Egypt , as the phenotyping and genotyping of these genes have not been extensively studied yet in these breeds.