01668nam a2200169 a 450000100080000000500110000800800410001910000160006024501620007626001920023830000140043052009860044465000110143070000150144170000190145670000230147518601672025-06-26       2010    bl uuuu     u00u1 u    #d1 aLEMA, O. M.  aComparação de modelos para ajuste do peso ao desmame de bovinos cruzados utilizando diferenças no critério de informação Akaike.h[electronic resource]  aIn: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA ZOOTECNIA, 47., 2010, Salvador. Empreendedorismo e progresso científicos na zootecnia brasileira de vanguarda: anais. Salvador: SBZ: UFBAc2010  c1 CD-ROM.  aCrossbreeding models comparison for weaning weight by Akaike information criterion differences. The aim of this study is to compare models to adjust weaning weight of crossbred cattle. A total of 4003 records were used, corresponding to 39 genotypes produced by crossing between Aberdeen Angus, Salers and Nelore with Hereford breeds. Data were obtained from the Facultad de Agronomia UDELAR of Uruguay between 1993 and 2002 from two experiments. Nine mixed models were compared, which starting from the additive model gradually incorporated non-additive effects. In all models, fixed effects contemporary group, sex and status of the cow, random effect of sire and the age at weaning (lineal) and birth weight as covariates were considered. Models including additive and dominance effects are not sufficient to explain the performance of crossed genotypes. The incorporation of direct and maternal epistatic interactions is necessary for designing effective crossbreeding systems.  aBovino1 aGIMENO, D.1 aCARDOSO, F. F.1 aDIONELLO, N. J. L.