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 and 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.

Description

Title: 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.
Author/s:
  • Arroyo Martínez, José María
  • Gonzalez Cano, Javier
Item Type: Article
Título de Revista/Publicación: Journal of Animal Physiology And Animal Nutrition
Date: 2013
ISSN: 0931-2439
Volume: 97
Subjects:
Faculty: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Department: Producción Animal [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

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.

More information

Item ID: 26244
DC Identifier: http://oa.upm.es/26244/
OAI Identifier: oai:oa.upm.es:26244
DOI: 10.1111/j.1439-0396.2011.01248.x
Official URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1439-0396.2011.01248.x/abstract
Deposited by: Memoria Investigacion
Deposited on: 16 Jul 2014 14:46
Last Modified: 22 Sep 2014 11:40
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