effect of different levels of yeast (saccaromyses cerveasia) and molasses on the nutritive value of atriplex lentiformis silage

abstract             this study was conducted to investigate the effects of different levels of yeast and molasses on chemical composition and nutritional value of artiplex lentiformis silage. the levels of yeast include: zero (control), 2.5 and 5 g/kg dry matter and levels of molasses include: zero (control), 10 and 15 percent that were added to atriplex and then ensiled. the experiment arranged in a factorial method (3×3) on based a completely randomized design. after determination of dry matter and chemical composition, gas production test and their parameters investigated in treatments. results showed that adding the levels of 2.5 g/kg yeast, increased dm content and ph, and decreased wsc content of silage. adding the levels of 5 g/kg yeast increased dm, ash, ndf, adf and decreased om,  ee, wsc content  and ph but had not significantly effects on cp content (p>0.05). adding the levels of 10 and 15 percentage molasses decreased ndf and adf content but increased dm and wsc content. highest cumulative gas production at 96 h incubation was obtained in treatment 3 (53.22) and lowest cumulative gas production was obtained in treatment 4(43.24). the levels of 5g/kg yeast and %15 molasses produced the highest amount cumulative gas production, omd and me. the results indicate adding levels of 5g/kg yeast and levels of 15 percentage molasses to atriplex lentiformis silage improve its nutritive value.