• فهرست مقالات cellulolytic bacteria

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        1 - Effects of Thyme Essential Oil and Disodium Fumarate on Ruminal Fermentation Characteristics, Microbial Population and Nutrient Flow in a Dual Flow Continuous Culture System
        ه. براز ح. جهانی-عزیزآبادی ع. عزیزی
        The aim of the present study was to investigate the effects of di-sodium fumarate (DSF) and thyme essential oil (TEO) solely and simultaneously on ruminal fermentation properties and microbial abundance. A dual-flow continuous culture system (DFCC) with eight 1400-mL fe چکیده کامل
        The aim of the present study was to investigate the effects of di-sodium fumarate (DSF) and thyme essential oil (TEO) solely and simultaneously on ruminal fermentation properties and microbial abundance. A dual-flow continuous culture system (DFCC) with eight 1400-mL fermenters was used in a period of 12 d that divided to 9 d for adaptation and 3 d for sampling. Fermenters were fed 100 g d-1 [dry matter (DM) basis] of a 50:50 alfalfa hay:concentrate ration. Treatments were no additive (control), 10 mM of DSF, 125 µL/L of TEO and simultaneous use of 10 mM of DSF, and 125 µL/L of TEO (SIMTF). Treatments had no effect on organic matter (OM) and neutral detergent fiber (NDF) disappearance, total and cellulolytic bacteria and protozoa abundance, large peptides and N-NH3 concentration of the effluent, N-NH3 and dietary N flow and molar proportions of acetate (C2), butyrate and isovalerate. DSF significantly increased crude protein (CP) degradation, the molar proportion of propionate (C3) and reduced C2:C3ratio (p <0.05). TEO decreased (p <0.05) DM disappearance (-14.4%) and total volatile fatty acid (-19.4%) concentration, relative to the DSF. Relative to the control, small peptide plus amino acid N concentration was higher (p <0.05) in TEO treatment and DSF. SIMTF increased (p <0.05) the acid detergent fiber (ADF) disappearance and decreased the N-NH3 concentration from zero to 4 h after feeding. Total N, non-ammonia N and bacterial N flow and efficiency of microbial CP synthesis increased with SIMTF. Findings demonstrated that feed efficiency and ruminal fermentation were improved by the simultaneous use of DSF and TEO. پرونده مقاله
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        2 - Ruminal Methane Emission, Microbial Population and Fermentation Characteristics in Sheep as Affected by <i>Malva sylvestris</i> Leaf Extract: <i>in vitro</i> Study
        ص. خاموشی ف. کفیل‌زاده ح. جهانی-عزیزآبادی و. ناصری
        The objective of this study was to investigate in vitro effect of Malva sylvestris leaf extract (at 0, 25, 50 and 100 &micro;L/30 mL of medium) on sheep ruminal cellulolytic and total viable bacteria growth, protozoa populations, methane production, neutral detergent fi چکیده کامل
        The objective of this study was to investigate in vitro effect of Malva sylvestris leaf extract (at 0, 25, 50 and 100 &micro;L/30 mL of medium) on sheep ruminal cellulolytic and total viable bacteria growth, protozoa populations, methane production, neutral detergent fiber degradability (NDFD) and fermentation efficiency of oat hay. The addition of Malva sylvestris leaf extract at 25, 50 and 100 &micro;L led to a linear increase (P&lt;0.01) in vitro truly degraded dry matter (INTDDM), NDFD and partitioning factor (PF) of oat hay and decrease (P&lt;0.01) methane emission after 24 hours of incubation. The addition of Malva sylvestris leaf extract resulted in a decrease (P&lt;0.01) in potential of gas production at 25 and 50 &micro;L and increase in lag time (0.95, 1.01 and 1.13 h relative to 0.61 h), constant rate of gas production (b)and gas produced at half-life (c)at 25, 50 and 100 &micro;L. The addition of this extract decreased a number of total protozoa and Entodinium, Isotrichae, Diplodinium and Ophryoscolex species (P&lt;0.01). The number of total and cellulolytic bacteria was not influenced by the addition of Malva sylvestris leaf extract. The result of this study demonstrated that Malva sylvestris extract had some potential for improving the rumen fermentation. پرونده مقاله