Resumo

PADILLA-DOVAL, J.; ZAMBRANO-ARTEAGA, J. C.; ECHEVERRI-ZULUAGA, J. J.  e  LOPEZ-HERRERA, A.. Genetic analysis of five single nucleotide polymorphisms of dairy caseins obtained with genomic chips in Holstein cattle from Antioquia, Colombia. Rev. Med. Vet. Zoot. [online]. 2021, vol.68, n.2, pp.137-149.  Epub 29-Nov-2021. ISSN 0120-2952.  https://doi.org/10.15446/rfmvz.v68n2.98026.

Genetic polymorphisms associated with milk caseins have a great importance since they can be used as genetic markers to improve productive performance in dairy herds. The main goal of the present study was to evaluate the diversity and genetic structure of 5 SNPs of milk caseins, obtained with genomic chip in Holstein cows and bulls from Antioquia (Colombia). 113 Holstein animals were sampled in 3 regions of Antioquia (north, center, and east), and a fourth group of commercial sires. Animals were geno-typed with high-density SNP chips (Illumina BovineHD and Illumina SNP50 v2), from which 5 SNPs were identified (ARS-BFGL-NGS-8140, BTA-77380-no-rs, BTA-32346-no-rs, BTB-00821654 and ARS-BFGL-NGS-15809). For each SNP, a genetic analysis was performed by means of an analysis of molecular variance (AMOVA) using the GenAIEx 6.501 software. The SNPs with the highest total heterozygosity (Ht) were ARS-BFGL-NGS-8140 and BTA-32346-no-rs, with results close to 45%; however, the HT for ARS-BFGL-NGS-15809, BTA-77380-no-rs, and BTB-00821654 were below 15%. The SNP with the highest genetic diversity was BTA-32346-no-rs (Ho-He = 0,06; p < 0,05). In this research a subpopulation of foreign commercial bulls was evaluated, in which similar allelic and genotypic frequencies to those for local subpopulations were obtained, suggesting that the alleles of the bulls are very possibly fixed in these subpopulations, so that the structure and genetic diversity tend to be low in the study sample.

Palavras-chave : Beta-casein; Kappa-casein; Milk yield; Genetic marker.

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