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Evaluación genómica en ganado Holstein Colombiano, usando genotipos imputados a densidad media

Genomic Evaluation of Colombian Holstein Cattle Using Imputed Genotypes at Medium Density



Cómo citar
Zambrano, J. C., Echeverri Zuluaga, J. J., & López Herrera, A. (2019). Evaluación genómica en ganado Holstein Colombiano, usando genotipos imputados a densidad media. Revista MVZ Córdoba, 24(2), 7248-7255. https://doi.org/10.21897/rmvz.1704

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PlumX
Juan C. Zambrano
José Julián Echeverri Zuluaga
Albeiro López Herrera

Juan C. Zambrano,

Institución Universitaria Colegio Mayor de Antioquia, Facultad de Ciencias de la Salud, Medellín, Colombia.
Fundación Universitaria Navarra. Facultad de Ciencias de la Salud, Neiva, Colombia.


Objetivo. Determinar la precisión y el sesgo de predicción de valores genómicos directos (VGD) usando genotipos imputados a densidad media, en características productivas y reproductivas en ganado Holstein de Antioquia, Colombia. Materiales y métodos. Fueron genotipificados 31 animales con el chip Illumina BovineLD, 64 con el chip Illumina BovineSNP50v2 y 48 con el chip Illumina BovineHD. La imputación se realizó usando dos paneles de SNPs (6K y 40K) a una densidad 44K, usando el programa FINDHAP.f90 v4. Los efectos de los SNPs fueron estimados mediante el método bayes_C, usando genotipos de baja densidad (6K) y genotipos imputados a una densidad media (44_imputado). La precisión y el sesgo de los VGDs fueron determinados mediante validación cruzada. Las características evaluadas fueron: producción de leche (PL), porcentaje de proteína (PRO), porcentaje de grasa (GRA), puntaje de células somáticas (SCS), intervalo entre partos (IEP) y días abiertos (DA). Resultados. Las precisiones de VGD (rpVGD;EBV) en todas las características evaluadas oscilaron entre 0.19 y 0.24 y el sesgo (bVGD;EBV) entre 0.03 y 0.16 cuando se usó el panel 6K y usando el panel 44K_imputado las precisiones fueron mayores, oscilado entre 0.24 y 0.33 y sesgo entre 0.03 y 0.26. Conclusiones. La precisión de predicción de los VGDs fue mayor cuando se usaron genotipos imputados a densidad media, en comparación con la precisión de predicción obtenida empleando genotipos de baja densidad. Por lo cual, en este estudio se concluye que la imputación de genotipos es muy útil dado que aumenta la confiabilidad de la evaluación genómica.


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