Variations among animals when estimating the undegradable fraction of fiber in forage samples

Autores

  • Cláudia Batista Sampaio Universidade Federal de Viçosa
  • Daiany Íris Gomes Universidade Federal Rural da Amazônia
  • José Gilson Louzada Regadas Filho Universidade Federal de Viçosa
  • Edenio Detmann Universidade Federal de Viçosa
  • Sebastião Campos Valadares Filho Universidade Federal de Viçosa

DOI:

https://doi.org/10.5433/1679-0359.2014v35n5p2739

Palavras-chave:

Indigestible fiber, Internal markers, Ruminal degradation.

Resumo

The objective of this study was to assess the variability among animals regarding the critical time to estimate the undegradable fraction of fiber (ct) using an in situ incubation procedure. Five rumenfistulated Nellore steers were used to estimate the degradation profile of fiber. Animals were fed a standard diet with an 80:20 forage:concentrate ratio. Sugarcane, signal grass hay, corn silage and fresh elephant grass samples were assessed. Samples were put in F57 Ankom® bags and were incubated in the rumens of the animals for 0, 6, 12, 18, 24, 48, 72, 96, 120, 144, 168, 192, 216, 240 and 312 hours. The degradation profiles were interpreted using a mixed non-linear model in which a random effect was associated with the degradation rate. For sugarcane, signal grass hay and corn silage, there were no significant variations among animals regarding the fractional degradation rate of neutral and acid detergent fiber; consequently, the ct required to estimate the undegradable fiber fraction did not vary among animals for those forages. However, a significant variability among animals was found for the fresh elephant grass. The results seem to suggest that the variability among animals regarding the degradation rate of fibrous components can be significant.

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Biografia do Autor

Cláudia Batista Sampaio, Universidade Federal de Viçosa

Profª, Deptº de Zootecnia, Universidade Federal de Viçosa, UFV, Viçosa, MG, Brasil.

Daiany Íris Gomes, Universidade Federal Rural da Amazônia

Prof., Universidade Federal Rural da Amazônia, UFRA, Parauapebas, PA, Brasil.

José Gilson Louzada Regadas Filho, Universidade Federal de Viçosa

Bolsista de Pós-Doutoramento, Deptº de Zootecnia, UFV, Viçosa, MG, Brasil.

Edenio Detmann, Universidade Federal de Viçosa

Profª, Deptº de Zootecnia, Universidade Federal de Viçosa, UFV, Viçosa, MG, Brasil.

Sebastião Campos Valadares Filho, Universidade Federal de Viçosa

Prof., Deptº de Zootecnia, Universidade Federal de Viçosa, UFV, Viçosa, MG, Brasil.

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Publicado

2014-11-05

Como Citar

Sampaio, C. B., Gomes, D. Íris, Regadas Filho, J. G. L., Detmann, E., & Valadares Filho, S. C. (2014). Variations among animals when estimating the undegradable fraction of fiber in forage samples. Semina: Ciências Agrárias, 35(5), 2739–2748. https://doi.org/10.5433/1679-0359.2014v35n5p2739

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