Effect of pH on cellulose digestion under <i>in vitro</i> conditions

Terry, R. A.; Tilley, J. M. A.; Outen, G. E.

doi:10.1002/jsfa.2740200514

Cited by 114 publications

(37 citation statements)

References 10 publications

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“…In this case, the association with concentrate probably reduced the digestibility of the fiber fraction of the roughage. The greater supply of nonfiber carbohydrates may reduce the fiber digestion by its inhibitory effect on cellulolysis or by inhibiting the sites of enzymatic digestion in the fibers, according to Terry et al (1969) and Murphy (1989).…”

Section: Discussionmentioning

confidence: 99%

Performance and digestibility of steers fed by-product of fresh passion fruit or sorghum silage, with and without concentrate supplementation

et al. 2015

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-The objective of this study was to evaluate the nutritive value of passion fruit by-product for cattle, contrasting the results with those found with sorghum silage. Four treatments were then constituted, comprising the combinations of the two roughages and the two levels of supplementation (with or without), in a completely randomized design with four animals per treatment. The considered variables included: feed intake, digestibility coefficients of the diets, and live weight gain of the animals. The experimental period lasted 70 days, preceded by a standardization period of 30 days. Chromium oxide was utilized to estimate the fecal output, in the digestibility trial. Treatments were compared by means of three orthogonal contrasts: between the two roughages and between the two concentrate levels within each roughage. Animals fed passion fruit by-product showed higher feed intake (total, per 100 kg of live weight (TLW), and per unit metabolic size) and had higher TLW gain than those fed sorghum silage (1.304 kg vs. 0.134 kg). The coefficients of apparent digestibility of dry matter (DM), organic matter (OM), and crude protein (CP) and the digestibility coefficient of neutral detergent fiber from passion fruit by-product were high, and much higher than those from sorghum silage. The concentrate supplement did not improve the TLW gain of animals fed passion fruit by-product and had a limiting effect on the digestibility coefficients of the diet. The concentrate supplement had a positive associative effect on intake and digestibility coefficients of DM, OM, and CP from sorghum silage. The by-product of fresh passion fruit is an excellent food for growing cattle as it provides high intake levels and weight gains, even when supplied as the only feed.

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Section: Discussionmentioning

confidence: 99%

Performance and digestibility of steers fed by-product of fresh passion fruit or sorghum silage, with and without concentrate supplementation

et al. 2015

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“…The increased concentration of acetate and propionate in silage mixtures containing high level of AF may be due to the higher CP content which leads to a more favorable fermentation environment (pH, NH 3 ) for growth of cellulolytic bacteria. Other researchers have showed that cellulolytic bacterial population could significantly increased by higher ruminal NH 3 (Khampa et al, 2006;Vinh et al, 2011) and the cellulolytic activity of rumen contents could be markedly inhibited by a fall of pH (Terry et al, 1969;Stewart, 1977) because of their influences on the rumen ecology. Higher ruminal NH 3 level may serve as N source to improve rumen ecology (Wanapat and Pimpa, 1999).…”

Section: In Vitro Rumen Degradability and Fermentation Of Ss-af Silagmentioning

confidence: 97%

Associative effects of ensiling mixtures of sweet sorghum and alfalfa on nutritive value, fermentation and methane characteristics

Zhang

Chaudhry

Osman

et al. 2015

Animal Feed Science and Technology

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a b s t r a c tCombining sweet sorghum (SS) with alfalfa (AF) for ensiling has the potential to improve the nutritive value and fermentation characteristics of resultant silages. However, the optimal combination and the associative effects of SS and AF for ensilage have not been studied. Therefore, the aim of this study was to determine the fermentation characteristic and nutritive value of silage mixtures with six different SS to AF ratios. The two forages were ensiled in air free silos for 150 days at room temperature as mixtures containing 0:100, 20:80, 40:60, 60:40, 80:20, and 100:0 of SS:AF on a fresh weight basis. As the proportion of SS increased in silage, the content of ash, crude protein, saponins, ammonia, acetic acid, propionic acid and pH decreased, while neutral detergent fiber, acid detergent fiber in organic matter, acid detergent lignin, water-soluble carbohydrate, starch, total phenolics and condensed tannins content increased. The silages were evaluated in 24-h incubations with rumen liquor. The in vitro rumen degradability of dry matter and organic matter as well as gas production, pH, ammonia, total volatile fatty acids and methane decreased as the proportion of SS increased in the silage mixtures. This study suggests that high quality silages can be made with SS:AF ratios of 20:80 and 40:60. These silage mixtures offer an opportunity to optimize the nutrient supply for ruminant production.

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“…In addition, rumen pH is one of the most critical determinants for rumen function as cellulolytic bacteria fail to grow below pH 6.0. While, early studies have reported that low rumen pH has negative effects on appetite (Shinozaki, 1959), microbial yield (Oliveira et al, 1997;Russell and Dombrowski, 1980), methane production (Lee et al, 2003), dry matter intake (Dewhurst et al, 2001), milk yield (Wanapat et al, 2009) and fiber digestion (Smith et al, 1973;Stewart, 1977;Terry et al, 1969).…”

Section: Resultsmentioning

confidence: 99%

Investigation of Dietary Lysophospholipid (Lipidol^TM) to Improve Nutrients Availability of Diet with In Vitro Rumen Microbial Fermentation Test

Cho¹,

Kim²,

Hwang³

et al. 2013

Journal of The Korean Society of Grassland and Forage Science

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This study was conducted to investigate the effect of biological membrane transfer modifier, lysophospholipd (LPLs) on the parameters from in vitro rumen simulated fermentation. Commercially available LPLs product (Lipidol TM ) was supplemented into experimental diets which consisted of orchard grass and concentrate diet (60:40) in different levels (0.1%, 0.3% and 0.5%). Then in vitro rumen simulated fermentation was performed. Although, a declining trend of pH was found in treatments, all pH values were detected in a range relevant to normal rumen fermentation. Gas production, ammonia nitrogen and total VFA production were greatly influenced by the supplementation of LPLs. All parameters were increased along with increased levels of LPLs in diet. As a result, 0.1% of Lipidol TM is recommended based on the determined in vitro rumen fermentative parameters in this study.

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Effect of pH on cellulose digestion under in vitro conditions

Cited by 114 publications

References 10 publications

Performance and digestibility of steers fed by-product of fresh passion fruit or sorghum silage, with and without concentrate supplementation

Performance and digestibility of steers fed by-product of fresh passion fruit or sorghum silage, with and without concentrate supplementation

Associative effects of ensiling mixtures of sweet sorghum and alfalfa on nutritive value, fermentation and methane characteristics

Investigation of Dietary Lysophospholipid (Lipidol^TM) to Improve Nutrients Availability of Diet with In Vitro Rumen Microbial Fermentation Test

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Effect of pH on cellulose digestion under in vitro conditions

Cited by 114 publications

References 10 publications

Performance and digestibility of steers fed by-product of fresh passion fruit or sorghum silage, with and without concentrate supplementation

Performance and digestibility of steers fed by-product of fresh passion fruit or sorghum silage, with and without concentrate supplementation

Associative effects of ensiling mixtures of sweet sorghum and alfalfa on nutritive value, fermentation and methane characteristics

Investigation of Dietary Lysophospholipid (LipidolTM) to Improve Nutrients Availability of Diet with In Vitro Rumen Microbial Fermentation Test

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Product

Resources

About

Investigation of Dietary Lysophospholipid (Lipidol^TM) to Improve Nutrients Availability of Diet with In Vitro Rumen Microbial Fermentation Test