Comparison of fermentation of diets of variable composition and microbial populations in the rumen of sheep and Rusitec fermenters. I. Digestibility, fermentation parameters, and microbial growth

Comparison of fermentation of diets of variable composition and microbial populations in the rumen of sheep and Rusitec fermenters. I. Digestibility, fermentation parameters, and microbial growth

15 páginas, 2 figuras, 5 tablas.

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Main Authors: Martínez, M. E., Ranilla, María José, Tejido, María L., Ramos, Sonia, Carro Travieso, Mª Dolores
Format: artículo biblioteca
Language:English
Published: American Dairy Science Association 2010
Subjects:Rusitec, Sheep, Forage:concentrate ratio, Microbial growth,
Online Access:http://hdl.handle.net/10261/45976
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spelling dig-igm-es-10261-459762021-03-18T16:54:29Z Comparison of fermentation of diets of variable composition and microbial populations in the rumen of sheep and Rusitec fermenters. I. Digestibility, fermentation parameters, and microbial growth Martínez, M. E. Ranilla, María José Tejido, María L. Ramos, Sonia Carro Travieso, Mª Dolores Rusitec Sheep Forage:concentrate ratio Microbial growth 15 páginas, 2 figuras, 5 tablas. Four ruminally and duodenally cannulated sheep and 8 Rusitec fermenters were used to determine the effects of forage to concentrate (F:C) ratio and type of forage in the diet on ruminal fermentation and microbial protein synthesis. The purpose of the study was to assess how closely fermenters can mimic the dietary differences found in vivo. The 4 experimental diets contained F:C ratios of 70:30 or 30:70 with either alfalfa hay or grass hay as the forage. Microbial growth was determined in both systems using (15)N as a microbial marker. Rusitec fermenters detected differences between diets similar to those observed in sheep by changing F: C ratio on pH; neutral detergent fiber digestibility; total volatile fatty acid concentrations; molar proportions of acetate, propionate, butyrate, isovalerate, and caproate; and amylase activity. In contrast, Rusitec fermenters did not reproduce the dietary differences found in sheep for NH(3)-N and lactate concentrations, dry matter (DM) digestibility, proportions of isobutyrate and valerate, carboxymethylcellulase and xylanase activities, and microbial growth and its efficiency. Regarding the effect of the type of forage in the diet, Rusitec fermenters detected differences between diets similar to those found in sheep for most determined parameters, with the exception of pH, DM digestibility, butyrate proportion, and carboxymethylcellulase activity. Minimum pH and maximal volatile fatty acid concentrations were reached at 2 h and at 6 to 8 h postfeeding in sheep and fermenters, respectively, indicating that feed fermentation was slower in fermenters compared with that in sheep. There were differences between systems in the magnitude of most determined parameters. In general, fermenters showed lower lactate concentrations, neutral detergent fiber digestibility, acetate: propionate ratios, and enzymatic activities. On the contrary, fermenters showed greater NH(3)-N concentrations, DM digestibility, and proportions of propionate, butyrate, isovalerate, valerate, and caproate. Values of efficiency of microbial growth were greater in fermenters compared with sheep for 70:30 diets, but they were lower for 30:70 diets. Differences between fermentation in sheep and fermenters can be mainly attributed to the lack of absorption in fermenters, differences in solid retention time, and compartmentalization in the Rusitec system. In general, the Rusitec system simulated more closely the in vivo fermentation of high-forage diets compared with high-concentrate diets. Spanish Ministerio de Educacion y Ciencia (AGL2004-04755-C02-01). Consejeria de Educacion de la Junta de Castilla y Leon (GR158). Ministerio de Educacion y Ciencia of Spain (AP2005-1797 BES-2005-6842). Peer reviewed 2012-02-21T09:55:50Z 2012-02-21T09:55:50Z 2010 artículo http://purl.org/coar/resource_type/c_6501 Journal of Dairy Science 93(8) : 3684-3698 (2010) 0022-0302 http://hdl.handle.net/10261/45976 10.3168/jds.2009-2933 en http://dx.doi.org/10.3168/jds.2009-2933 none American Dairy Science Association
institution IGM ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-igm-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del IGM España
language English
topic Rusitec
Sheep
Forage:concentrate ratio
Microbial growth
Rusitec
Sheep
Forage:concentrate ratio
Microbial growth
spellingShingle Rusitec
Sheep
Forage:concentrate ratio
Microbial growth
Rusitec
Sheep
Forage:concentrate ratio
Microbial growth
Martínez, M. E.
Ranilla, María José
Tejido, María L.
Ramos, Sonia
Carro Travieso, Mª Dolores
Comparison of fermentation of diets of variable composition and microbial populations in the rumen of sheep and Rusitec fermenters. I. Digestibility, fermentation parameters, and microbial growth
description 15 páginas, 2 figuras, 5 tablas.
format artículo
topic_facet Rusitec
Sheep
Forage:concentrate ratio
Microbial growth
author Martínez, M. E.
Ranilla, María José
Tejido, María L.
Ramos, Sonia
Carro Travieso, Mª Dolores
author_facet Martínez, M. E.
Ranilla, María José
Tejido, María L.
Ramos, Sonia
Carro Travieso, Mª Dolores
author_sort Martínez, M. E.
title Comparison of fermentation of diets of variable composition and microbial populations in the rumen of sheep and Rusitec fermenters. I. Digestibility, fermentation parameters, and microbial growth
title_short Comparison of fermentation of diets of variable composition and microbial populations in the rumen of sheep and Rusitec fermenters. I. Digestibility, fermentation parameters, and microbial growth
title_full Comparison of fermentation of diets of variable composition and microbial populations in the rumen of sheep and Rusitec fermenters. I. Digestibility, fermentation parameters, and microbial growth
title_fullStr Comparison of fermentation of diets of variable composition and microbial populations in the rumen of sheep and Rusitec fermenters. I. Digestibility, fermentation parameters, and microbial growth
title_full_unstemmed Comparison of fermentation of diets of variable composition and microbial populations in the rumen of sheep and Rusitec fermenters. I. Digestibility, fermentation parameters, and microbial growth
title_sort comparison of fermentation of diets of variable composition and microbial populations in the rumen of sheep and rusitec fermenters. i. digestibility, fermentation parameters, and microbial growth
publisher American Dairy Science Association
publishDate 2010
url http://hdl.handle.net/10261/45976
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