English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/56587
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Effect of carbohydrate source on microbial nitrogen recycling in growing rabbits

AuthorsBelenguer, Álvaro ; Abecia, L.; Belanche, A.; Milne, Eric; Balcells, Joaquín
Protein metabolism
Issue Date2012
CitationLivestock Science 150(1-3): 94-101 (2012)
AbstractIn rabbits, caecal fermentation relies to a large extent on the type of substrate available for bacteria. Therefore, in order to study the dietary effect of the source of carbohydrate on microbial nitrogen (N) absorption, thirty-two New Zealand growing male rabbits were randomly assigned to four diets formulated using two sources of structural carbohydrates (fibre), alfalfa hay (AH) and sugar beet pulp (SBP), combined with two sources of non-structural carbohydrates (starch), wheat or maize, at a constant fibre/grain sources ratio (0.80/0.20). Microbial N intake was estimated by preventing caecotrophy with a neck collar and, indirectly, by using urinary purine derivative (PD) excretion and microbial 15N-lysine incorporation. No effect of diet on growth was detected (average growth rate 26.6±0.69g/d), although dry matter (DM) intake was greater in animals fed diets with AH as main source of fibre than those receiving SBP (100.2 vs. 90.1g/d; P<0.01). Nonetheless, the latter diets were better digested and no significant differences were observed in digestible organic matter (OM) intake. Between sources of starch, digestibility of DM, OM and N was greater with wheat than maize (P<0.05). Microbial activity in the caecum was stimulated by SBP diets, as indicated by a greater volatile fatty acid concentration (89.6 vs. 67.5mmol/L; P<0.01) and a lower pH (5.7 vs. 6.2; P<0.001). Significantly higher amino acid 15N-enrichments in both caecotrophes and liver were observed with SBP diets and also in maize-fed rabbits when SBP was the main fibre source. However, microbial contribution to tissue amino acids (0.37±0.008) was not affected by the type of fibre.
Description5 tablas, 1 figura. Published online 10 September 2012.
Publisher version (URL)http://dx.doi.org/10.1016/j.livsci.2012.08.005
Appears in Collections:(IGM) Artículos
Files in This Item:
File Description SizeFormat 
Post print_Belenguer et al Livestock Science (en prensa).docx147,27 kBMicrosoft Word XMLView/Open
Show full item record
Review this work

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.