Abstract

MEJIA, L. G; HERNANDEZ, R. A; ROSERO, C. Y  and  SOLARTE, C. E. ANALYS IS OF GENETIC DIVERSITY OF DAIRY CATTLE IN THE HIGH TROPIC OF NARIÑO BY MOLECULAR HETEROLOGOUS MICROSATELLITE MARKERS. Rev. Med. Vet. Zoot. [online]. 2015, vol.62, n.3, pp.18-33. ISSN 0120-2952.  https://doi.org/10.15446/rfmvz.v62n3.54937.

Five populations of cattle (Bos taurus) from tropical high of Narino were characterized with 11 loci microsatellites. The breeds included were Holstein, Jersey, Normande, Brown Swiss and Creole. The molecular characterization of breeds and study genetic relationships were made with Alleles frequencies. Genetic diversity as the number of alleles per locus (NPA = 10) and observed heterozygosity (Ho = 0.7) were high, being higher for the Creole breed. Analysis of molecular variance (AMOVA), showed low genetic differentiation (FST = 0.0663) for the total population, with a small difference between Creole and Holstein (0.006). This result was similar to the Bayesian clustering analysis, which identified a percentage of absorption of 56% to Creole by the Holstein breed. The high diversity assumes processes of adaptation to different environments and miscegenation, showing a continuous gene flow. The above can be explain by cross-breeding to increase the production volume on the basis of the Holstein breed. Detrimental impacts, due to the intensive selection, might this have on the creole cattle and has influence in their adaptive capacity.

Keywords : cattle breed; microsatellite; variability; introgression.

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