02034naa a2200301 a 450000100080000000500110000800800410001910000230006024500920008326000090017550001240018452010480030865000170135665000140137365000140138765300210140165300210142265300210144365300270146465300180149165300210150965300140153065300290154465300260157370000220159970000220162177300890164311184672018-07-25       2006    bl uuuu     u00u1 u    #d1 aSOUZA, E. F. M. de  aDesigns and model effects definitions in the initial stage of a plant breeding program.  c2006  aTítulo em português: Delineamentos e definições de efeitos no modelo em estágios iniciais de melhoramento vegetal.  aThe objective of this work was to compare the relative efficiency of initial selection and genetic parameter estimation, using augmented blocks design (ABD), augmented blocks twice replicated design (DABD) and group of randomised block design experiments with common treatments (ERBCT), by simulations, considering fixed effect model and mixed model with regular treatment effects as random. For the simulations, eight different conditions (scenarios) were considered. From the 600 simulations in each scenario, the mean percentage selection coincidence, the Pearsons´s correlation estimates between adjusted means for the fixed effects model, and the heritability estimates for the mixed model were evaluated. DABD and ERBCT were very similar in their comparisons and slightly superior to ABD. Considering the initial stages of selection in a plant breeding program, ABD is a good alternative for selecting superior genotypes, although none of the designs had been effective to estimate heritability in all the different scenarios evaluated.  aheritability  asugarcane  aSeleção  aaugmented design  abloco incompleto  acana-de-açúcar  adelineamento aumentado  aherdabilidade  aincomplete block  aselection  asimulação estocástica  astochastic simulation1 aPETERNELLI, L. A.1 aBARBOSA, M. H. P.  tPesquisa Agropecuária Brasileira, Brasília, DFgv. 41, n. 3, p. 369-375, mar. 2006