Abstract
The main objective of this study was to evaluate three cycles of full-sib family selection in the ‘Colus o2’ variety of maize (Zea mays L.). Selection was directed primarily for yield among fullsib families and simultaneously within full-sib families for more vitreous kernels with good lysine levels and free of kernel rots. Families were compared with a check hybrid in each selection trial. The cycles and topcrosses of each cycle by two homozygous opaque-2 testers grown at three locations in 1978 provided measures of the gain due to three cycles of selection. Regression analysis showed that during three cycles of full-sib family selection, grain yield increased 2.86 q/ha or 5.46% per cycle. Average gain of the two top-crosses was 2.63 q/ha or 4.1% per cycle, relative to the non-improved variety.
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