Covariance components and genetic parameters for growth traits in a population of "Coastal Costeño con Cuernos" cattle in Colombia [Componentes de covarianza y parámetros genéticos para características de crecimiento en una población de ganado Costeño con Cuernos en Colombia]
Perez Garcia J.E.,Corporacion Colombiana de Investigaciones Agropecuarias CORPOICA |
Mitat A.,Agricultural University of Havana |
Ossa Saraz G.A.,Corporacion Colombiana de Investigaciones Agropecuarias CORPOICA |
Simanca J.C.,University of Córdoba, Colombia |
Vergara Garay O.D.,University of Córdoba, Colombia
Livestock Research for Rural Development | Year: 2015
The aim of this study was to estimate the components of (co) variance and genetic parameters for birth weight (BW), weaning weight (WW) and weight at 16 months (W16), using different models unicaracter in a population of cattle Creole Costeño con Cuernos (CCC). 3060 records of BW, 2594 of WW, and 1990 of W16 were used. Six statistical models were applied, which included the fixed effects of contemporary group (year-season-sex-parity) as covariate and age at weaning and 16 months. The direct additive genetic random effect of the animal was common to all models and maternal additive genetic effects, maternal permanent environmental, and genetic covariance between direct and maternal effects were alternated. Estimates of components of variance were performed using the program ASREML.According to the test of likelihood ratio, the best model was the one that included the random effects of animal, maternal and maternal permanent environment, also the covariance between direct and maternal effects. Estimation of direct and maternal heritabilities varied between different models for each of the traits analyzed. Genetic correlations between direct and maternal effects for BW were positive (0.81 to 0.98) and negative for WW (-0.30 to -0.35) and W16 (-0.12). According to the estimates of heritability for the traits, should improve the conditions of feeding and management, to enhance the expression of these traits in the population. © 2015, Fundacion CIPAV. All rights reserved.
Oscar Vergara G.,University of Córdoba, Colombia |
Gustavo Ossa S.,Corporacion Colombiana de Investigaciones Agropecuarias CORPOICA |
Julieth Cabrera A.,University of Córdoba, Colombia |
Juan Simanca S.,University of Córdoba, Colombia |
Juan Perez G.,Corporacion Colombiana de Investigaciones Agropecuarias CORPOICA
Revista MVZ Cordoba | Year: 2016
Objective. The aim of this study was to estimate heritabilities and genetic trends for reproductive traits in a beef cattle population Romosinuano. Material and methods. Age at first calving (AFC), first calving interval (FCI), and second calving interval (SCI) were evaluated from a database generated from 1951 to 2011 by Research Center Turipana. Unicaracter animal model was used, which included fixed of contemporary group (year-season), random direct genetic additives effects and residual. Estimates of variance components and genetic parameters were obtained through Restricted Maximum Likelihood procedure, using AIREMLF90 program. Genetic trends were calculated as a linear regression of weighted averages of breeding values over the years, using the REG procedure of Statistical Analysis System. Results. The indices of heritability for additive genetic effects were 0.04 ± 0.05 for AFC, 0.06 ± 0.06 for FCI, and 0.09 ± 0.06 for SCI. Conclusions. Low heritabilities indicating that should improve nutritional and management conditions in the herd, so that they can better express the traits evaluated. The estimated genetic trends were near zero, which shows that the objective of the CI Turipaná regarding this population has complied fully preserving the genetic variability of the breed Romosinuano.