![]() ![]() ![]() ![]() These results show that some environmental factors affect growth in BON population and reveal that a substantial proportion of the variation in growth traits of Colombian BON cattle is associated with the direct additive genetic effect with the maternal genetic effect (except for YW and T60%) and that these traits can respond appropriately to selection processes. QTLs were identified associated with residual feed intake and with different growth traits in other breeds. Two regions were also identified, one region within BTA1 and the other in BTA3 with big effect on 4 of the 6 traits under analysis, evidencing the existing genetic correlation between growth traits. Genomic associations showed different signals with effect on growth traits within genomic regions containing genes that are part of important biological processes and QTL, especially in BTA1, BTA2, BTA3, BTA6, BTA7, BTA10 and BTA14. The Pearson and Spearman correlations between the EBVs varied between 0.77 and 0.96, a large amount being greater than 0.90. For most of the estimates obtained using genomics, an increase of between 0.01 and 0.11 points was observed in the accuracy of the estimated breeding values (EBVs) except for the maternal WW (-0.01) and maternal T120 (-0.17). When the genetic evaluation with the genomic one was compared, it was found that for most of the traits the ssGBLUP methodology increased between 0.01 and 0.22 the direct heritability estimate, while the maternal heritability estimate varied between -0.01 and 0.09 points difference. High and positive direct genetic correlations were observed between BW, WW, YW and ADG (0.84 to 0.99) high and negative (-0.66 to -1) between T20 with the traits BW, WW, YW and ADG moderate to low and negative between T60% with BW, WW, YW and ADG (-0.02 to -0.51) and high and positive between T60% and T120 (0.60). Low and medium direct and maternal heritability values were obtained, being 0.22 and 0.14 (BW), 0.20 and 0.15 (WW), 0.17, and 0.25 (ADG), 0.26 and 0.16 (T120), and direct heritability values of 0.20 (YW) and 0.44 (T60%). The genomic association studies were performed using a Bayes Cπ. The genomic evaluation also included the genomic information. Conventional genetic evaluations were performed trough animal models uni and bivariates. ![]() The fixed effects of calving number, contemporary group, sex and age at weighing and the random effects animal and matern (except PA and T60) were included. Genealogy information of 7799 animals was used, 3218, 2264, 496, 2287, 325 and 408 phenotypic records of growth traits birth weight (BW), weaning weight ( WW), yearling weight (TW), average daily gain at weaning (ADG), time to reach 120 kg (T120) of living weight and time to reach 60% of adult weight (T60%), respectively and genotype information of 439 animals for 107999 SNPs. A phenotypic, genetic and genomic analysis was performed. The aim of this work was to evaluate the genetic and genomic component of the Colombian Creole BON, using single nucleotide markers (SNPs) and to identify genomic regions associated with productive traits. Studying the traits involved in the growth of Blanco Orejinegro (BON) cattle and the environmental and genetic factors that are responsible for their variation is of great importance to stimulate its breeding. ![]()
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