Varietal differences in the chemical composition and <i>in vitro</i> digestibility of rice straw

Vadiveloo, J.

doi:10.1017/s0021859600071513

Cited by 27 publications

(13 citation statements)

References 17 publications

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“…The morphological composition of the present six varieties was similar to the varieties reported by Vadiveloo (1992) but varied from the varieties reported by Vadiveloo (1995) being higher in leaf content. The absolute values for constant a and constant b for untreated straw (Tables 3 and 4) were lower than similar values obtained by the nylon bag or gas production techniques (Walli et al, 1988;Nakashima and 0rskov, 1990;Shen et al, 1998b) probably because cellulase dry matter degradation only mimics part of the complex process taking place in the rumen (Lopez et al, 1998).…”

Section: Discussionsupporting

confidence: 79%

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Cellulase degradation of whole rice straw

Vadiveloo¹

2000

J. Anim. Feed Sci.

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The dry matter degradation in a cellulase-buffer solution of the whole straw of six Malaysian rice varieties was estimated before and after treatment for 21 days in a 4% urea or 4% sodium hydroxide (NaOH) solution. Degradation characteristics were estimated from the equation p = a + b (l-e ct ). Both urea and NaOH treatment significantly increased the rapidly degradable (constant a) and slowly degradable (constant b) fractions. The degradation rate (constant c) was significantly reduced by urea treatment but not by NaOH treatment. The degradation constants were independent of the agronomic and morphological characteristics of the untreated straws.

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Section: Discussionsupporting

confidence: 79%

“…Studies on the nutritive value of Malaysian rice straw varieties have employed cellulase to estimate end-point digestion (Vadiveloo, 1992(Vadiveloo, , 1995. As the degradation characteristics of Malaysian rice straw varieties have not been documented, the present study was initiated.…”

Section: Introductionmentioning

confidence: 99%

Cellulase degradation of whole rice straw

Vadiveloo¹

2000

J. Anim. Feed Sci.

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“…These results suggest that the improvement of IVDMD and IVOMD depends on the forage chemical characteristics and the supplement used, corroborating with Morgavi et al (2000), who stated that more detailed knowledge of the interaction between the supplement with the forage, the host, and the rumen microorganisms is necessary for the correct application of this technology. Previous research had also identified variation in rice straw digestibility (Vadiveloo, 1992;Vadiveloo, 1995) and improvement of forage in vitro digestibility with the use of mineral and protein-energy supplement (Barbosa et al, 2007) and exogenous fibrolytic enzyme (Beauchemin et al, 2003;Bassiouni et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

Additives on in vitro ruminal fermentation characteristics of rice straw

et al. 2017

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-The objective of this study was to evaluate the effects of mineral and protein-energy (MPES), exogenous fibrolytic enzyme supplements (ES), combination of MPES + ES, and straw without supplement (WS) on digestibility, fermentation kinetic parameters, cumulative gas production, methane, CO 2 production, and volatile fatty acid concentration of rice straw of low and high nutritional value, estimated by in vitro techniques. The experimental design was randomized and factorial 2 × 4: two straws (low and high nutritional value) incubated with four supplements (MPES, ES, MPES + ES, and WS) and their interactions. Four experimental periods were used, totaling four replications per treatment over time. Data were analyzed by PROC MIXED of SAS. The in vitro dry matter and organic matter digestibilities of the rice straw with high nutritional value was improved by MPES, while the combination of MPES + ES supplements inhibited the digestibility of this straw. Dietary carbohydrate and nitrogen increased through MPES and MPES + ES supplements resulted in an increase in NH 3 -N concentration and a decrease in CO 2 production due to the microbial mass formation. However, this increase was not enough to improve organic matter degradability parameters, cummulative gas production, gas production kinetics, and acetate:propionate ratio and reduce methane emissions. The straw with high nutritional value showed greater content of nitrogen fraction a, effective degradability, cummulative gas production, and methane and CO 2 productions comparing with low-nutritional value straw. The use of MPES and MPES + ES supplements can be used as strategy to mitigate CO 2 in ruminant production systems that use rice straw.Key Words: digestibility, digestion kinetics, fatty acid, gas production, methane Revista Brasileira de Zootecnia

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“…Varietal differences in IVDMD of rice straw have been reported from many countries and have been first summarized by Doyle et al [91]. Vadiveloo [177] observed later a whole plant IVDMD ranging from 23.6 to 36.9 in rice straws, when the IVDMD of stems ranged from 27.6 to 43.3%. Agbagla-Dohnani et al [4] observed an in sacco degradability of organic matter in straws of 15 rice varieties ranging from 23.6 to 35.6%.…”

Section: Genetic Variation In Cell Wall Digestibility Estimated From mentioning

confidence: 96%

Genetic variation and breeding strategies for improved cell wall digestibility in annual forage crops. A review

et al. 2003

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-Forage plants are the basis of ruminant nutrition, and cell wall digestibility is the limiting factor of their feeding value. Cell wall digestibility is therefore "the" target for improving the feeding value of forage crops. Among annual forages, maize cropped for silage making is the most widely used, and much research in genetics, physiology and molecular biology of annual forages is devoted to maize. Sorghum, immature small grain cereals and straws of small grain cereals are also given to cattle. Some dicotyledons are or were also used, such as forage beets, kales, canola in temperate areas and amaranths in tropical and subtropical areas. Large genetic variation for cell wall digestibility was proved from both in vivo and in vitro experiments in numerous species. Among the regular maize hybrids (excluding brown-midrib ones), the NDF in vivo digestibility nearly doubled from 32.9 to 60.1%. Correlations between in vivo and in vitro estimates of cell wall digestibility were often close to 0.75, but in vitro estimates of cell wall digestibility significantly reduced the range of variation between genotypes. Despite lignin content is well known as the major factor making cell wall undigestible, breeding for a higher digestibility of plant only from a lignin content trait appeared impossible. Correlations between lignin content and cell wall digestibility were indeed greatly variable according to the genetic background. Moreover, enzymatic solubilities were excessively dependent on lignin, and correlation between in vivo estimates of cell wall digestibility and lignin content were always lower than correlation between in vitro estimates of cell wall digestibility and lignin content. Among brown-midrib genes, the bm3 mutant in maize, and the bmr12 (and possibly bmr18) mutant in sorghum, which are both altered in the COMT activity, appeared as the most efficient in cell wall digestibility improvement. Moreover, a great genetic variation in the efficiency of the maize bm3 gene for cell wall digestibility improvement was observed according to the genetic background, with a lower efficiency when the normal germplasm was of better cell wall digestibility. Efficient breeding maize and others annual forage plants demands a renewing of genetic resources. Because resources of interest in cell wall digestibility improvement could be of poor agronomic value, the best is likely to cell wall digestibility / ingestibility / annual forage / maize / genetic variation / breeding / lignin Résumé -Amélioration de la digestibilité des parois des fourrages annuels. Les plantes fourragères sont à la base de l'alimentation des ruminants, mais leur valeur nutritive est limitée par la digestibilité variable des parois végétales, dont l'amélioration est alors la cible essentielle des programmes de sé-lection. Parmi les fourrages annuels, le maïs est la plante la plus cultivée, et c'est sur cette espèce que porte l'essentiel de la recherche en génétique, physiologie et biologie moléculaire. Toutefois, le sorgho, les céréales à paill...

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Varietal differences in the chemical composition and in vitro digestibility of rice straw

Cited by 27 publications

References 17 publications

Cellulase degradation of whole rice straw

Cellulase degradation of whole rice straw

Additives on in vitro ruminal fermentation characteristics of rice straw

Genetic variation and breeding strategies for improved cell wall digestibility in annual forage crops. A review

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