Abstract
Genetic parameters are associated with corn kernel characteristics were estimated using parent/offspring regressions, variance components analyses and the intra-class correlations of half-sibs. The experimental and mating design used is that of Comstock and Robinson Design II, with four inbred males mated to each of four unrelated inbred females to generate a complete set of sixteen half-sibs. Parents were also selfed to generate eight parental values. The experiment was conducted at two Texas locations: College Station and Thrall. Genetic parameters estimated include additive, additive-by-environment, dominance and dominance-by-environment variances and their standard errors, together with heritability estimates and their standard errors. Estimates were generated within each location and across both locations, using male, female and combined sources of variation. Genetic covariance matrices were also partitioned, and genetic and environmental correlations between all pairs of traits calculated. Kernel characteristics analysed include density, 1000 kernel weight, 100 kernel volume, test weight, percent floaters, a grinding test and a breakage test. Environmental variance was estimated using both the homozygous parental population and the heterozygous single-cross population. Heterosis and heterotic patterns were also examined, and intraclass correlations were computed using both maternal and paternal half-sib analysis..
Mangal, Motie Jagdis (1989). Estimates of genetic parameters in corn using parent/offspring regression and the intra-class correlation of half-sibs. Texas A&M University. Texas A&M University. Libraries. Available electronically from
https : / /hdl .handle .net /1969 .1 /DISSERTATIONS -1109086.