Effects of the ruminal comminution rate and microbial contamination of particles on accuracy of in situ estimates of ruminal degradability and intestinal digestibility of feedstuffs.

Arroyo Martínez, José María y Gonzalez Cano, Javier (2013). Effects of the ruminal comminution rate and microbial contamination of particles on accuracy of in situ estimates of ruminal degradability and intestinal digestibility of feedstuffs.. "Journal of Animal Physiology And Animal Nutrition", v. 97 (n. 1); pp. 109-118. ISSN 0931-2439. https://doi.org/10.1111/j.1439-0396.2011.01248.x.

Descripción

Título: Effects of the ruminal comminution rate and microbial contamination of particles on accuracy of in situ estimates of ruminal degradability and intestinal digestibility of feedstuffs.
Autor/es:
  • Arroyo Martínez, José María
  • Gonzalez Cano, Javier
Tipo de Documento: Artículo
Título de Revista/Publicación: Journal of Animal Physiology And Animal Nutrition
Fecha: 2013
Volumen: 97
Materias:
Escuela: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Departamento: Producción Animal [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

Effects of considering the comminution rate -kc- and the correction of microbial contamination -using 15N techniques- of particles in the rumen on estimates of ruminally undegraded fractions and their intestinal digestibility were examined generating composite samples -from rumen-incubated residues- representative of the undegraded feed rumen outflow. The study used sunflower meal -SFM- and Italian ryegrass hay -RGH- and three rumen and duodenum cannulated wethers fed with a 40:60 RGH to concentrate diet -75 g DM/kgBW0.75-. Transit studies up to the duodenum with Yb-SFM and Eu-RGH marked samples showed higher kc values -/h- in SFM than in RGH -0.577 vs. 0.0892, p = 0.034-, whereas similar values occurred for the rumen passage rate -kp-. Estimates of ruminally undegraded and intestinal digestibility of all tested fractions decreased when kc was considered and also applying microbial correction. Thus, microbial uncorrected kp-based proportions of intestinal digested undegraded crude protein overestimated those corrected and kc-kp-based by 39% in SFM -0.146 vs. 0.105- and 761% in RGH -0.373 vs. 0.0433-. Results show that both kc and microbial contamination correction should be considered to obtain accurate in situ estimates in grasses, whereas in protein concentrates not considering kc is an important source of error.

Más información

ID de Registro: 26244
Identificador DC: http://oa.upm.es/26244/
Identificador OAI: oai:oa.upm.es:26244
Identificador DOI: 10.1111/j.1439-0396.2011.01248.x
URL Oficial: http://onlinelibrary.wiley.com/doi/10.1111/j.1439-0396.2011.01248.x/abstract
Depositado por: Memoria Investigacion
Depositado el: 16 Jul 2014 14:46
Ultima Modificación: 22 Sep 2014 11:40
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