Bias in the prediction of genetic gain due to mass and half-sib selection in random mating populations
Genet. mol. biol
; 32(3): 497-506, 2009. tab
Article
en En
| LILACS
| ID: lil-522308
Biblioteca responsable:
BR26.1
ABSTRACT
The prediction of gains from selection allows the comparison of breeding methods and selection strategies, although these estimates may be biased. The objective of this study was to investigate the extent of such bias in predicting genetic gain. For this, we simulated 10 cycles of a hypothetical breeding program that involved seven traits, three population classes, three experimental conditions and two breeding methods (mass and half-sib selection). Each combination of trait, population, heritability, method and cycle was repeated 10 times. The predicted gains were biased, even when the genetic parameters were estimated without error. Gain from selection in both genders is twice the gain from selection in a single gender only in the absence of dominance. The use of genotypic variance or broad sense heritability in the predictions represented an additional source of bias. Predictions based on additive variance and narrow sense heritability were equivalent, as were predictions based on genotypic variance and broad sense heritability. The predictions based on mass and family selection were suitable for comparing selection strategies, whereas those based on selection within progenies showed the largest bias and lower association with the realized gain.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
LILACS
Asunto principal:
Plantas
/
Selección Genética
/
Interpretación Estadística de Datos
Tipo de estudio:
Clinical_trials
/
Prognostic_studies
/
Risk_factors_studies
Idioma:
En
Revista:
Genet. mol. biol
Asunto de la revista:
GENETICA
Año:
2009
Tipo del documento:
Article
País de afiliación:
Brasil