239 research outputs found
Bias in the prediction of genetic gain due to mass and half-sib selection in random mating populations
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
Implications of predictable and unpredictable environmental factors in common bean VCU trials in Minas Gerais
Comparação de métodos de adaptabilidade e estabilidade relacionados à produtividade de grãos de cultivares de milho
Biometric analysis of protein and oil contents of soybean genotypes in different environments
Análise conjunta de ensaios de cultivares de milho por classes de interação genótipo x ambiente
Interaction genotype by season and its influence on the identification of beans with high content of zinc and iron
Depressão endogâmica e heterose de híbridos de populações F2 de milho no estado de São Paulo
Estratificação ambiental na avaliação de genótipos de feijoeiro-comum tipo Carioca em Goiás e no Distrito Federal
- …