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Frequencies Evaluation of β-Casein Gene Polymorphisms in Dairy Cows Reared in Central Italy. | LitMetric

Frequencies Evaluation of β-Casein Gene Polymorphisms in Dairy Cows Reared in Central Italy.

Animals (Basel)

Istituto Zooprofilattico Sperimentale dell'Umbria e delle Marche-Togo Rosati (IZSUM), Via Salvemini 1, 06126 Perugia, Italy.

Published: February 2020

AI Article Synopsis

Article Abstract

The majority of proteins in cow's milk are caseins, which occur in four groups (α-s1, α-s2, β, and k) encoded by different genes (, , , and , respectively). In this study, we focused on the β-casein allele variants A1 and A2 due to their influence on milk's technological characteristics and human health. Digestion of the β-casein variant A1 leads to the formation of β-casomorphin 7 (BCM-7), a bioactive peptide that has been suggested to be a possible cause of various human diseases and associated with low milk digestibility. The potential negative role of the β-casein variant A1 in human health has stimulated the planning of cattle breeding programs based on genetic selection to increase the frequency of the A2 variant, which is associated with increased milk digestibility. The aim of this work was to evaluate the frequencies of the different β-casein variants in Italian Holstein Friesian dairy cows from cattle farms located in central Italy to select a population of A2 homozygous animals. β-casein genotypes were identified by evaluating the presence of single nucleotide polymorphisms (SNPs) of the gene using PCR and sequencing analysis. The frequency of the desirable β-casein variant A2 in the studied bovine population was 0.61. The frequency of the undesirable A1 variant in the studied bovine population was 0.30. The frequency of the A2 allele was higher than expected for the breed; therefore, genetic selection for the A2 variant in these animals could be achieved in a fairly short time using A2 homozygous bulls.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7070732PMC
http://dx.doi.org/10.3390/ani10020252DOI Listing

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