Statistical analysis of the data on individual characters was
performed using SAS v9.1 (SAS Institute, Inc., 2002–2003).
Line means were estimated using the REML option of the SAS
MIXED procedure taking lines as fixed and replicates and
blocks within replicates as random. For broad-sense heritability
(H) estimates, variance components were estimated for a model
wherein all factors were considered random using the REML
option of the SAS VARCOMP procedure. Variance component
estimates were used to calculate H as