Publications by authors named "Luis Gabriel Gonzalez Herrera"
This study aimed to estimate variance components (VCs) for growth and reproductive traits in Nellore cattle using two relationship matrices (pedigree relationship A matrix and pedigree plus genomic relationship H matrix), and records collected before and after genomic selection (GS) implementation. The study also evaluated how genomic breeding values (GEBV) are affected by variance components and discarding old records. The analysed traits were weight at 120 days (W120), weight and scrotal circumference at 450 days (W450 and SC450, respectively).
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- - Milk production in tropical regions is economically and socially important, involving dual-purpose animals created from a mix of Zebu and specialized dairy breeds, but uncontrolled mating can hinder effective breeding programs.
- - This study evaluated genomic diversity in a highly crossbred cattle population using data from 859 genotyped animals and identified low population structure and a blend of Zebu, Creole, and European Taurine genetics.
- - Findings highlight the advantages of crossbreeding for tropical dairy but stress the need for more controlled mating practices to improve breeding outcomes and genetic diversity.
Bovine leukemia virus (BLV) is a retrovirus that primarily infects dairy cows. Although few studies have also used the gene, phylogenetic studies of BLV use mostly the gene. The aim of this work was to establish the circulating genotypes of BLV in specialized dairy cattle from Antioquia, Colombia.
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- - The study focuses on improving beef cattle profitability by addressing reproductive traits like age at first calving and gestation length, which are challenging due to their low heritability and sex-limited characteristics.
- - Researchers aimed to identify specific genomic regions in the Blanco Orejinegro (BON) breed that affect these reproductive traits using a large dataset of 439 animals and over 118,000 genetic markers (SNPs).
- - Findings revealed significant genetic factors associated with reproductive, growth, immune response, and environmental adaptation traits, suggesting important implications for genetic improvement and conservation efforts for Colombian creole cattle.
The Blanco Orejinegro (BON) is a Colombian creole cattle breed that is not genetically well characterized for growth traits. The aim of this work was to estimate genetic parameters for birth weight (BW), weaning weight (WW), yearling weight (YW), daily weight gain between birth and weaning (DWG), time to reach 120 kg of live weight (T120), and time to reach 60% of adult weight (T60%), and establish the selection criteria for growth traits in the BON population of Colombia. Genealogical and phenotypic information for BW, WW, YW, DWG, T120, and T60% traits of BON animals from 14 Colombian herds were used.
View Article and Find Full Text PDFNeosporosis is a parasitic disease that causes abortions and economic losses in bovine production systems, but no studies have been found concerning its effect on the Creole cattle breed, Blanco Orejinegro (BON). The aim of this research was to establish the serological status of Colombian BON cattle against Neospora caninum and to determine the factors associated with seropositivity. Blood samples were taken from 363 animals from 13 herds in six states of Colombia, and analyzed by indirect ELISA using a commercial test.
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