Resumo

AMAYA, A.; MARTINEZ, R.  e  CERON-MUNOZ, M. F.. Genetic parameters for milk production in Simmental cattle (Bos taurus) using genomic and polygenic models. Rev. Med. Vet. Zoot. [online]. 2019, vol.66, n.2, pp.131-140. ISSN 0120-2952.  https://doi.org/10.15446/rfmvz.v66n2.82431.

The aim of this study was to estimate genetic parameters with and without the inclusion of genomic relationship in cumulative milk production of Simmental cattle in Colombia for 60 (MP60), 150 (MP150), 210 (MP210) and 305 (MP305) days. A total of 2883 test records from 620 cows in first lactation were used. The genomic information was obtained from 718 animals genotyped with a commercial chip with a density of 30,106 single nucleotide polymorphism (SNP) genetic markers. Univariate and bivariate models were used under the conventional best linear unbiased predictor (BLUP) and the single step genomic BLUP (ssGBLUP) methodologies. The heritability estimate values for MP60, MP150, MP210 and MP305 ranged from 0.20 to 0.27, 0.25 to 0.52, 0.30 to 0.35 and 0.20 to 0.23, respectively. The use of the genomic relationship did not increase heritabilities nor the accuracy of estimates for milk traits. The lack of phenotypic records and the low genetic connectivity between genotyped and non-genotyped populations could limit the genetic selection procedures for milk production via the ssGBLUP in Colombian Simmental cattle.

Palavras-chave : variance components; dairy cattle; molecular markers; genetic improvement; genomic selection.

        · resumo em Espanhol     · texto em Espanhol     · Espanhol ( pdf )