Effect of silica on the colonization of rice straw by ruminal bacteria

Bae, Hee Dong; McAllister, Tim A.; Kokko, E. G.; Leggett, Frances; Yanke, L. J.; Jakober, K. D.; Ha, Jong K.; Shin, H.T.; Cheng, K.-J.

doi:10.1016/s0377-8401(96)01093-0

Cited by 56 publications

(34 citation statements)

References 23 publications

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“…The decrease in NDFom content following ammoniation was consistent with the existing data (Bae et al, 1997). As expected, the most important effects of ammonia treatment were on cell wall structure.…”

Section: Discussionsupporting

confidence: 91%

Rumen digestion of rice straw structural polysaccharides: effect of ammonia treatment and lucerne extract supplementation in vitro

Agbagla-Dohnani

Cornu

Broudiscou

2012

animal

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The combined effects of lucerne (Medicago sativaL.) extract supplementation and ammonia treatment of rice straw (Oryza sativa, variety Thaibonnet) on the ruminal digestion of cell wall components were investigated in six continuous culture systems using a randomised complete block design. Data were fitted to second-order polynomial models. Untreated rice straw had higher contents of ash-free cell wall residues (CWR; 763v.687 g/kg dry matter (DM)) and non-cellulosic sugars (191v.166 g/kg DM) than treated rice straw. Ammoniation preferentially removed xylose, which resulted in a lower xylose-to-arabinose ratio (5.1v.5.8). In absence of lucerne supplementation and ammoniation, degradability coefficients were 0.54, 0.46, 0.58, 0.54, 0.42 and 0.60 for cellulose–glucose, xylose, arabinose, galactose, mannose and uronic acids, respectively. Both factors had significant effects on the microbial degradation of structural polysaccharides. With lucerne extract at an optimal level, ammonia treatment increased ash-free cell wall degradation by more than 10%. The degradability coefficients were increased by ammoniation without any significant interaction with lucerne extract, except for glucose, whose degradability was mostly influenced by lucerne extract in a curvilinear way. The comparison of regression coefficients in cell wall and CWR models suggested that ammoniation improved the degradabilities of xylose, galactose and mannose by partly solubilising the corresponding hemicelluloses and by improving the susceptibility of the remaining fraction to microbial attack, whereas it increased the degradability of arabinose only by favouring microbial attack.

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Section: Discussionsupporting

confidence: 91%

Rumen digestion of rice straw structural polysaccharides: effect of ammonia treatment and lucerne extract supplementation in vitro

Agbagla-Dohnani

Cornu

Broudiscou

2012

animal

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“…However, the possible mechanisms by which silica adversely affects the digestibility of the cell wall of rice straw may be related to its role as a physical barrier (Bae et al, 1997;Kim et al, 2002) or as an inhibitor of enzymatic hydrolysis in the rumen (AgbaglaDohnani et al, 2003), which reduced the accessibility of wall carbohydrates to digestive microorganism attack.…”

Section: Discussionmentioning

confidence: 99%

Nutritional value of baled rice straw for ruminant feed

et al. 2016

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-The objectives of this study were to evaluate the effects of cultivation and hay making factors on chemical composition, protein fractionation, and digestibility in rice straw, as well as to identify the chemical fractions that contribute to the variation in its nutritional value for ruminants. Statistical procedures were performed in a model that included rice crop cycle, sowing season, baling season, soil classification, fertilizer application, and productivity (kg/ha) as fixed effects and the hay bale as random effect. Chemical composition, protein fractionation, and digestibility data were subjected to multivariate analyses including factor, cluster, and discriminant. Considering the cultivation and haymaking factors, development cycle, baling season, and grain production explained the most variation in the rice straw nutritional value. Straws derived from early maturing cultivars showed the lowest levels of neutral detergent fiber, acid detergent fiber, acid detergent insoluble nitrogen, and C nitrogen fraction in comparison with straw originating from mid cycle cultivars. Rice straw from more productive cultivars had lower levels of lignin and C fraction as well as higher levels of crude protein and B3 fraction compared with straws from less productive cultivars. However, the main variation in the nutritional value between the samples of rice straw was related to the baling season. The bailing seasons were grouped in two clusters. Straws with better nutritional value were those with lower levels of cell wall fractions, from more productive crops, with early development cycle and baled until March. Rice crop cycle, baling season, and grain production effects explain the variation in the nutritional value of rice straws. Straws with better nutritional value have lower levels of fractions related to secondary cell wall and lignification.

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“…Retention of silica bodies in this substrate may have made it unfavourable for the organism. Silica bodies have been reported to prevent bacterial attachment to plant biomass and are also inhibitory to cellulolytic microorganisms (Bae et al 1997).…”

Section: Endoglucanase Production On Ms Compared To Ssmentioning

confidence: 99%

Effects of Pretreatment of Single and Mixed Lignocellulosic Substrates on Production of Endoglucanase by Bacillus aerius S5.2

Oke¹,

Ishola²,

Taherzadeh³

et al. 2016

BioResources

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A mixed substrate (MS) comprising oil palm empty fruit bunch (EFB), oil palm frond (OPF), and rice husk (RH) was evaluated for endoglucanase production by Bacillus aerius S5.2. Effects of sulphuric acid, sodium hydroxide, N-methylmorpholine-N-oxide (NMMO), and hydrothermal pretreatments on endoglucanase production were investigated. Endoglucanase production by B. aerius on the untreated (0.677 U/mL) and pretreated MS (0.305 -0.630 U/mL) was generally similar, except that the acid (0.305 U/mL) and hydrothermal (0.549 U/mL) pretreatments that were more severe consequently produced significantly lower titres. Alkali pretreatment supported the highest enzyme production (0.630 U/mL) among all pretreatments that were studied. When endoglucanase production on the alkali-pretreated MS and single substrates (SS) was compared, alkali-pretreated EFB produced a titre (0.655 U/mL) similar to the MS, and this was significantly higher than titres recorded on OPF (0.504 U/mL) and RH (0.525 U/mL). Lower enzyme production was found to be consistent with higher pretreatment severity and greater removal of amorphous regions in all the pretreatments. Furthermore, combining the SS showed no adverse effects on endoglucanase production.

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Effect of silica on the colonization of rice straw by ruminal bacteria

Cited by 56 publications

References 23 publications

Rumen digestion of rice straw structural polysaccharides: effect of ammonia treatment and lucerne extract supplementation in vitro

Rumen digestion of rice straw structural polysaccharides: effect of ammonia treatment and lucerne extract supplementation in vitro

Nutritional value of baled rice straw for ruminant feed

Effects of Pretreatment of Single and Mixed Lignocellulosic Substrates on Production of Endoglucanase by Bacillus aerius S5.2

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