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Utilize este identificador para citar ou criar um link para este item: http://acervodigital.unesp.br/handle/11449/4609
Título: 
Effect of pelleting and pellet size of a concentrate for intensively reared beef cattle on in vitro fermentation by two different approaches
Autor(es): 
Instituição: 
  • Univ Zaragoza
  • Universidade Estadual Paulista (UNESP)
  • Nutreco Ruminant Res Ctr
ISSN: 
0377-8401
Financiador: 
  • NUTRECO Nederland B.V.
  • Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Número do financiamento: 
  • NUTRECO Nederland B.V.: OTRI 2007/0035
  • CAPES: PHB2005-0111-PC
Resumo: 
Two in vitro experiments were performed to evaluate the effect of concentrate pelleting for intensively reared cattle on rumen microbial fermentation. In Experiment 1, a concentrate was incubated as meal (M) or pelleted to 3.5 (P3.5) and 10 (P10) mm diameter, either in their original form or re-ground to 1 mm particle size (MG, P3.5G and P10G) and their gas production pattern was studied. When the concentrate was incubated in its original form, gas produced with M was higher than with P10 at 1 h and from 3 to 6h of incubation (P<0.05). showing that pelleting to 10 mm diameter delayed microbial fermentation of the concentrate at the initial stages of incubation. When the concentrate was incubated ground, MG produced the lowest gas volume up to 8 h (P<0.05), but there were no differences with P10G afterwards. This indicates that, once avoided the limitation of microbial accessibility by pellet and particle size, fermentation increased because starch gelatinisation was promoted by processing. However, the magnitude of this effect was not different between the two pellet sizes. In Experiment 2, the original forms of concentrate (M, P3.5 and P10) were incubated for 24 h in a semicontinuous incubation system at pH 6.5 and 5.8, and concentration of volatile fatty acid (VFA) was monitored at 4 and 10 h. The pH reduction decreased gas production throughout the experimental period (P<0.001). Gas production from M was higher than P10 up to 4h (P<0.05), at 6h and from 20 to 24h (P<0.10). Total VFA concentration at 4h was lowest with P10 (P<0.01), but no differences were recorded at 10 h. Results from Experiment 2 support those from Experiment 1, even at pH 5.8 and at a liquid outflow rate of 0.10/h, that could be expected in intensively reared beef cattle. (C) 2010 Elsevier B.V. All rights reserved.
Data de publicação: 
11-Ago-2010
Citação: 
Animal Feed Science and Technology. Amsterdam: Elsevier B.V., v. 159, n. 3-4, p. 88-95, 2010.
Duração: 
88-95
Publicador: 
Elsevier B.V.
Palavras-chaves: 
  • Pelleting
  • particle size
  • In vitro fermentation
  • pH
  • Intensively reared cattle
Fonte: 
http://dx.doi.org/10.1016/j.anifeedsci.2010.05.010
Endereço permanente: 
Direitos de acesso: 
Acesso restrito
Tipo: 
outro
Fonte completa:
http://repositorio.unesp.br/handle/11449/4609
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