In order to study the influence of cellulase (CEL) additive on the quality of napier grass(Pen-nisetum purpureum) and corn straw (Zea mays 1. Var. Rugosa Bonaf. ) mixed silage, the mixed ratio of napier grass to corn straw at 70:30 was treated with cellulase at the levels of 0. 000%(control), 0. 001%(l U/g) , 0. 005%(5 U/g) and 0. 025%(25 U/g). Ensilaged for 60 days at normal temperature, the ferment-ational indexes were measured with three replicates for each treatment. The results indicated that cellulose can significantly reduce neutral detergent fiber and hemi-cellulose(P<0. 01) and increase lactic acid (P< 0. 01). The dry matter , dry matter recovery were the highest in silage with 0. 005% cellulose among the four treatments ,of which the pH, acetic acid, ammonia nitrogen and acid detergent fiber were significantly lower than other treatments while LA and WSC were higher(P<0. 01). The results showed that adding 0. 005% cellulase was the best for napier grass and corn straw mixed silage.
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