Influencia de la inclusión del efecto materno en la estimación de parámetros genéticos del peso al destete en un hato de ganado de carne

ABSTRACT: The component of (co)variance and genetic parameters for weaning weight trait in animals of pure (Brahman) or crossbreed (Zebu cattle) breeds were estimated, with the aim to estimate and to compare the genetic parameters and genetic value with or without including the maternal genetic effects by mean of Animal model, using MTDFREML program. Five models were considered including 1) the maternal genetic group, 2) calving, and 3) contemporary group as fixed effects, 4) direct and maternal genetic effects and 5) maternal permanent environmental effects, as random effects, and finally the residual error effect. Direct heritability coefficients varied form median to low (h2 a, 0.10 to 0.29) in all models. Models that included the maternal genetic effect presented the lowest values of maternal heritability (h2 m, 0.07 to 0.17). The genetic correlations between direct and maternal effects were negative and with low magnitude (-0.18 and -0.29). The models were compared between each other using the Maximum Likelihood method (- 2 log L) based on a X2 test, and it gave as result that the best model was the five one (Y = Xb + Z1a + Z3m + Z2ep + e) which included all effects.

• Autores: Quintero, Juan Carlos; Triana, Juan G.; Quijano Bernal, Jorge Humberto; Arboleda Zapata, Elkin Mauricio
• Tipo de recurso: Article of investigation
• Fecha de publicación: 2007
• Institución: Universidad de Antioquia
• Repositorio: Repositorio UdeA
• Idioma: spa
• OAI Identifier: oai:bibliotecadigital.udea.edu.co:10495/7779
• Acceso en línea: http://hdl.handle.net/10495/7779
• Palabra clave: Brahman; Cebú comercial; Efecto genético directo; Efecto genético materno; Ganado brahman; Ganado cebú; Ganado de carne; Parámetros genéticos; Peso al destete
• Rights: openAccess
• License: Atribución-NoComercial-CompartirIgual 2.5 Colombia (CC BY-NC-SA 2.5 CO)