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The effect of different harvesting times on yield and silage quality of maize, sorghum and sorghum × Sudan grass hybrids grown in a split plot design with 3 replicates during the second crop under semiarid conditions were evaluated. Whole plant silage chemical composition and DM digestibilities in different times, measured in vivo were determined. Two maize (DK 711, TTM 815), 2 sorghum (Sucro sorgo 506, FS 5) and 2 sorghum-Sudan grass hybrids (P 988, Grazer N2) cultivars were harvested at 3 different maturity stages (mid-flowering-MF, milkline-ML and hard dough-HD). The chopped materials were ensiled in 10-litre anaerobic jars for 60 days. Silage samples were dried; CP, FP, pH, ADF and NDF contents were measured and incubated in 3 fistulated Holstein-Friesian heifers for determining dry matter digestibility. Incubation periods were 0, 12, 24, 48 and 72 h for determining dry matter digestibility by using …