الفهرس 
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Abstract
The goal of this study is the estimation of heterosis and genetic variances using a factorial mating design of several lines of Zea mexicana to know the superior parental lines and hybrids for the most important studied traits in to choose the best breeding programs The results of present study confirms that:The magnitudes of the mean squares for genotypes were highly significant for all studied traits.The means showed that no specific parent and/or cross were superior or inferior for all studied traits.Concerning heterosis relative to mid-parents (HM.P %) and better parent (HB.P %) most of the studied crosses exhibited different heterosis values at the different three cuts. The results indicated the magnitudes of additive genetic variances which were larger than their corresponding estimates of non-additive genetic variances with respect to all studied traits except for plant height, leaf area and dry fodder yield per plant at the second cut (C2).