Nutritive value of Damascus rose extraction residue ensiled with different effluent absorbents


Abstract: Two experiments were conducted to study the silage characteristics and nutritive value of Damascus rose extraction residue (RER) which is a by-product remained after the extraction of rose water in some parts of Iran. In the first experiment, RER was ensiled together with different amounts of effluent absorbents, using a completely randomised design with 10 treatments and 4 replicates. In the second experiment, RER was ensiled together with dry sugar beet pulp, wheat straw, and limestone. The contents of OM, CP, CF, EE, and NFE were 94.4%, 11%, 24%, 24%, and 57.3%, respectively, in the initial samples of RER. The DM content of silages varied from 26.7% to 36.6%, pH-values ranged from 4.08 to 4.36, which denotes a significant difference (P < 0.05). In experiment 2, the DM and CP of silage were 25% and 9.7%, respectively, and the pH value was 4.6. The in vivo digestibility of DM and OM were 54.2% and 57.6%, respectively, and voluntary intake for DM and OM was 41.7 and 36.6 g/kgBW0.75, respectively, in sheep. Total digestible nutrients were 52.1% and metabolisable energy was 7.87 MJ/kgDM. A linear relationship was observed between OM digestibility and TDN with in vitro gas production.

Keywords: Rose extraction residue, silage, nutritive value

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