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Barley (Hordeum vulgare L.) breeding programs recognize eastern and western Canada as separate target regions, but the extent of local adaptation to regions and subregions within them has not been studied. Genotype region and subregion interactions were estimated in 145 lines from the two-row barley cross Harrington/TR306 in 22 trials in 1992-1993. The trials were grouped into five subregions (MaritimesQuebec,...
In a small target region, it may be possible to exploit local adaptation to increase gains from selection. However, in a large region more extensive testing is usually possible, resulting in more precise estimation of genotype means. A correlated response model was adapted to determine if division of a large target region is likely to increase gains. Genotypic value in a large region and constituent...
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