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Polymorphism of three milk protein genes in Mexican Jersey cattle
Zepeda-Batista, José Luis; Alarcón-Zúñiga, Baldomero; Ruíz-Flores, Agustín; Núñez-Domínguez, Rafael & Ramírez-Valverde, Rodolfo
Abstract
The objective was to estimate the allelic and genotypic frequencies, genetic diversity and polymorphic
information content for the β-casein, κ-casein and β-lactoglobulin genes. Blood and frozen semen samples
were collected from 453 Jersey individuals registered by the Mexican Jersey Cattle Association. Twenty eight
breed specific SNP primers for whole genes were used. The B allele of κ-casein had higher frequency (0.69)
than the A (0.26) and E (0.05). For β-lactoglobulin, the highest frequency was for B (0.72), followed by A and
C alleles (0.26 and 0.02, respectively). The β-casein allele with the highest frequency was A2 (0.71), followed
by A1 (0.19), A3 (0.05), B (0.04) and C (0.01). The average genetic diversity (He) was 0.53. The average locus
effective allele number was 1.79. These results indicate a high allelic diversity for κ-casein, β-casein and
β-lactoglobulin that could be included in breeding programs in the population studied, aimed to improve the
milk quality traits of economic importance.
Keywords
β-Casein; β-Lactoglobulin; Genetic diversity; κ-Casein
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