Effects of raw and heated palygorskite on rumen fermentation in vitro
Abstract To investigate the effect of raw and heated palygorskite on rumen fermentation in an in vitro gas-production system, 54 incubators were evenly divided into three groups: control (0% palygorskite), treatment I (3% raw palygorskite) and treatment II (3% heated palygorskite). The effect of heated modification on the microstructure of palygorskite was investigated by X-ray diffraction and scanning electron microscopy analyses. The physicochemical features were evaluated by zeta potential analysis, cation-exchange capacity, ethylene blue absorption and specific surface area (the BET method). Gas production (GP) was recorded at 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22 and 24h of incubation in vitro . The 18 incubators from each group were stopped at 6h, 12h and 24h, respectively, and the inoculants were determined for rumen fermentation parameters. The results showed that the GP in the treatment groups was higher than in the control group starting at 4h of incubation ( P P P P P P P P 3 -N in the treatment I group was higher than in the control group at 24h ( P P Highlights The thermal treatment process does not evidently damage the crystal structure of palygorskite. The adsorption capacity of heated palygorskite was increased. Supplemental raw and heated palygorskite improve rumen microbial fermentation. Supplemental palygorskite promotes VFA formation and nitrogen use, especially heated palygorskite. Supplemental raw and heated palygorskite affect rumen pH value.
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