تغييرات تركيبات شيميايي و قابليت هضم علف ني در طي فصل رشد و خصوصيات سيلويي آن

Variation of chemical composition and digestibility of common reed forage during growth stage and characteristices of reed forage ensilage

This experiment was conducted to study the variations in chemical composition during the growth stage and characteristices of reed forage ensilage. Sampling of reed forage during the growth stage was done every 2 weeks for 3 months for investigation of variation in chemical composition. Results were analyzed in a completely randomized design with 6 treatments and 5 replications. The determined chemical composition of samples were CP, DM ,OM, Ash, NDF, ADF, Hemicelloluse ,IVDMD and IVOMD. Means of CP,IVDMD and IVOMD were decreased (from 16.56,42.10 and 39.95 to 10.31,28.68 and 27.83 percent respectively) and means of NDF and ADF were increased (from 63.34 and 35.12 to77.76 and 41.64 percent respectively)with advancing growth period (p< 0.05). from Hoveize marsh 200 kg of reed forage harvested and choppered(I -3 cm length) and laboratory reed forage silage were prepared with 4 levels of molasses (0,5,10 and 15%) and 2 levels of inoculant, containing I x I010CFUgʹ Lactobacillus plantarum (0 and 2.5 ppm) in 5 replication. This experiment was conducted in a completely randomized design with a factorial arrangment (2x4x5=40). Adding 15 percent molasses decreased pH (from 4.62 to 4.16), ADF(from 37.10% to 30.34%), celloluse (from 29.16% to 22.49%) and increased CP (from 10.21% to 10.98%) and IVDMD (from 27.58% to 36.76%) (p< 0.05). Bacteria inoculation did not have any significant effect on improving silage quality. Based on this results harvesting date for reed forage proposed to be between the first to middle of the month of may, and adding Lactobacillus plantarum silage was not effective, but adding 15% molasses proposed for silage preparing and improved its quality.