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Dry matter yield and ear percent are commonly considered the most important factors for evaluating silage corn(Zea mays L.) hybrids for silage production. But quality of stover as well as forage production in important in identification of hybrids. The objective of this study was to evaluate nutriti...

Dry matter yield and ear percent are commonly considered the most important factors for evaluating silage corn(Zea mays L.) hybrids for silage production. But quality of stover as well as forage production in important in identification of hybrids. The objective of this study was to evaluate nutritional value of stover, ear and whole plant from eight corn hybrids for silage at two dates of planting. In content of fiber components(ADF, NDF, ADL, hemicellulose and cellulose) from stover, ear and whole plant samples, optimum planting corn was lower than late planting one(P<0.01). Differences(P<0.01) in the content of fiber components in stover and whole plant were observed among the corn hybrids. Differences between different planting dates in TDN and $NE_1$ were detected in the stover and whole plant samples(P<0.05). Differences among the corn hybrids in TDN and $NE_1$ were also observed in stover, ear and whole plant samples. TDN and $NE_1$ of 'G4624', 'P3352' and 'P3394' for whole plant were higher than those of the other corn hybrids. ln vitro dry matter digestibility(IVDMD) at optimum planting date was higher than that of late(P<0.05), and there also were significant differences among the corn hybrids. Correlation coefficients for whole plant IVDMD with NDF, ADF, hemicellulose, and cellulose were $-0.82^{**}$, $-0.71^{**}$, $-0.63^{**}$, and $-0.69^{**}$, respectively. Results of this study indicate that optimum planting of corn resulted in increased quality of silage corn. Differences among corn hybrid, particularly, in nutritive value of stover and whole plant were also observed. Therefore, the nutritional value of stover and whole plant may be important in assessing the corn hybrids for silage.

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