Adjustment of pH and enzymatic treatment of barley straw by dry processing method

A three-factor, three-level, face-centred cubic design was adopted to investigate the effect of three pre-treatment parameters, namely sodium hydroxide-to-dry biomass ratio [0.00, 0.05, and 0.10 (w/w)], lime-to-dry biomass ratio [0.00, 0.05, and 0.10 (w/w)] and residence reaction time (24, 96, and 168 h), at moderate temperature (21°C) on 24-h cumulative gas production (GP 24 ) and delignification, as the response variables. Under the optimal pre-treatment conditions of NaOH-to-dry biomass ratio of 0.09 (w/w), lime-to-dry biomass ratio of 0.09 (w/w) and residence time of 160.3 h, the model predicted 151.6 mL gas/g organic matter (OM) versus the experimental value of 147.2 mL gas/g OM. Under the optimal conditions of NaOH-to-dry biomass ratio of 0.10 (w/w), lime-to-dry biomass ratio of 0.08 (w/w) and residence time of 156.8 h, sugarcane bagasse (SCB) was maximally delignified by 41.2%, whereas the model predicted 43.6% delignification. Under the optimal conditions determined for GP 24 , the neutral detergent fibre degradability of the pre-treated biomass after 24 and 48 h was 37.2 and 56.3%, respectively, a 1.90-fold and 1.58-fold over the untreated biomass, respectively. Overall, it was found that combined alkali treatment at optimal conditions effectively enhanced the ruminal degradability of SCB.

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Pre-treatment of sugarcane bagasse with a combination of sodium hydroxide and lime for improving the ruminal degradability: optimization of process parameters using response surface methodology

Ahmadi

Zamiri

Khorvash

et al. 2015

Journal of Applied Animal Research

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Rumen degradation and nutritive utilization of wheat straw, corn stalks and sugarcane bagasse ensiled with multienzymes

Gado

Elghandour

Cipriano

et al. 2016

Journal of Applied Animal Research

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The aim of this study was to determine the effect of anaerobic ensiling of raw agricultural wastes with a fibrolytic enzyme cocktail (EZ) as a cleaner and sustainable biological product for animal feed. Ten 1-kg samples of wheat straw, corn stalks and sugarcane bagasse were chopped at 5 cm length and mixed with EZ at three levels of 0, 1 or 3 L enzyme/ton of feed, moistened to a relative humidity of approximately 50% and ensiled in plastic bales for 30 days. Additionally, fibrous samples were incubated for 72 h with rumen liquor to determine the digestion of dry matter (DM), neutral detergent fibre and acid detergent fibre. Increasing enzyme level lowered ether extract and nitrogen-free extract contents of fibrous feeds and increased the biodegradation of acid detergent lignin of wheat straw. Anaerobic ensiled corn stalks and sugarcane bagasse with EZ improved the biodegradation of DM and fibre fractions. It could be concluded that ensiling fibres of the three wastes with EZ improved and enhanced their ruminal digestion with the biodegradation rate at 3 L/ton and subsequently produced a cleaner product for animal feed from agriculture wastes.

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EEffect of Partial Replacement of Alfalfa Hay with Wheat Straw on Digestibility and Growth Performance of Fattening Male Lambs

Mohammadi-Mehr

Ghasemi

Khorvash

2018

rap

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The objective of this study was to evaluate the effect of partially replacing forage sources (alfalfa hay) with treated wheat straw on nutrient digestibility, chewing activity, blood metabolites, rumen fermentation, and performance of finishing lambs. Wheat straw (WS) was treated with 7 % sodium hydroxide, 3.5 % salt, and 3.3 % calcium carbonate and then ensiled for 2 months. Twenty-three male lambs (28 kg) were randomly allocated to three diets differing in forage sources: 1) control diet (100 % alfalfa hay), 2) 1/3 WS (67 % alfalfa hay and 33 % wheat straw) and 3) 2/3 WS (33 % alfalfa hay and 67 % wheat straw). Results indicated that ruminal degradability (24 and 48 h incubation) of treated wheat straw and alfalfa hay was similar, but higher than untreated straw (P<0.01). Dry matter intake and chewing time decreased linearly (P= 0.01), but no change in chewing time/DMI was observed with increasing WS levels in the diet. Feeding the diets containing WS improved fiber digestibility (P<0.01), tended to decrease ruminal pH (P=0.08, quadratic effect), and increased ruminal ammonia-N (P=0.04), molar acetate proportion (P=0.05), and total volatile fatty acids concentration (P=0.02, quadratic effect). Moreover, average daily gain (P=0.02) and feed efficiency (P=0.08) was enhanced quadratically with increasing levels of WS in the diet. Carcass weight, blood metabolites and molar proportions of propionate and butyrate were not affected by the dietary treatments. Overall, the results indicated that partially replacing alfalfa hay with wheat straw had no adverse impacts on the performance of finishing lambs, but feeding 1/3 WS increased fiber digestibility, daily gain and feed efficiency.

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Adjustment of pH and enzymatic treatment of barley straw by dry processing method

Cited by 3 publications

References 14 publications

Pre-treatment of sugarcane bagasse with a combination of sodium hydroxide and lime for improving the ruminal degradability: optimization of process parameters using response surface methodology

Pre-treatment of sugarcane bagasse with a combination of sodium hydroxide and lime for improving the ruminal degradability: optimization of process parameters using response surface methodology

Rumen degradation and nutritive utilization of wheat straw, corn stalks and sugarcane bagasse ensiled with multienzymes

EEffect of Partial Replacement of Alfalfa Hay with Wheat Straw on Digestibility and Growth Performance of Fattening Male Lambs

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