Analysis of variance (ANOVA) was carried out in a randomized complete block design (RCBD) using GenStat Discovery Edition 4 software package. Each of the harvest intervals was considered as a source of variation and taken as a block (replicate). Post-ANOVA statistical analysis was conducted using least significant difference (LSD) (p = 0.05) to declare significant differences among the harvest intervals. Duncan’s multiple range test (DMRT) (p = 0.05) was, however, used to determine significant differences among the genotypes since there were more than five treatment means (Gomez and Gomez, 1984). Pearson’s bivariate correlation coefficients (p = 0.05) between plant height, dry matter content and dry matter yield were also calculated using Predictive Analytics Software (PASW) version 18.