Resumen de Estudio de la precisión realizada obtenida en los dos años de evaluaciones genómicas en el vacuno lechero español
José Antonio Jiménez Montero, Noureddine Charfeddine, O. González Recio
Genomic-assisted evaluations were first officially implemented in the Spanish dairy cattle in November 2012. Those genomic bulls are now progeny tested. Here, we evaluated the realized reliability of the first genomic evaluations by comparing the genomic predictions with the progeny proof. The genomic proofs were more accurate than the pedigree index for the 12 analysed traits. The genomic proofs were, in average, 42% more accurate than the pedigree index. For the total merit index (ICO), the genomic proof was 29% more accurate compared to the pedigree index. Bias was also smaller with the genomic proofs, with prediction closer to the ‘a posteriori’ observed progeny proofs. Almost half of the genomic predictions (42%) differed in less than 200 points of ICO from the posterior progeny proof, compared to the 39% for pedigree index. Further, 12% of the pedigree indices varied in more than 600 points of ICO compared to the progeny proof, whereas only 6% of the genomic proofs had such a large prediction bias. The genetic progress for the total merit index (ICO) increased between 28 and 71 % for the dam-cow and sire-bull paths
