Effects of the correction of particle microbial contamination and particle transit model in the rumen on in situ protein evaluation of grass hays.

Guevara, J. and Gonzalez Cano, Javier and Arroyo Martínez, José María and Moya, Vicente Jimeno and Piquer, Olga (2013). Effects of the correction of particle microbial contamination and particle transit model in the rumen on in situ protein evaluation of grass hays.. "Animal Production Science", v. 53 (n. 2); pp. 134-141. ISSN 1836-5787. https://doi.org/10.1071/AN11320.

Description

Title: Effects of the correction of particle microbial contamination and particle transit model in the rumen on in situ protein evaluation of grass hays.
Author/s:
  • Guevara, J.
  • Gonzalez Cano, Javier
  • Arroyo Martínez, José María
  • Moya, Vicente Jimeno
  • Piquer, Olga
Item Type: Article
Título de Revista/Publicación: Animal Production Science
Date: January 2013
ISSN: 1836-5787
Volume: 53
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 particle comminution rate -kc- in addition to particle rumen outflow -kp- and the ruminal microbial contamination on estimates of by-pass and intestinal digestibility of DM, organic matter and crude protein were examined in perennial ryegrass and oat hays. By-pass kc-kp-based values of amino acids were also determined. This study was performed using particle transit, in situ and 15N techniques on three rumen and duodenum-cannulated wethers. The above estimates were determined using composite samples from rumen-incubated residues representative of feed by-pass. Considering the comminution rate, kc, modified the contribution of the incubated residues to these samples in both hays and revealed a higher microbial contamination, consistently in oat hay and only as a tendency for crude protein in ryegrass hay. Not considering kc or rumen microbial contamination overvalued by-pass and intestinal digestibility in both hays. Therefore, non-microbial-corrected kp-based values of intestinal digested crude protein were overestimated as compared with corrected and kc-kp-based values in ryegrass hay -17.4 vs 4.40%- and in oat hay -5.73 vs 0.19%-. Both factors should be considered to obtain accurate in situ estimates in grasses, as the protein value of grasses is very conditioned by the microbial synthesis derived from their ruminal fermentation. Consistent overvaluations of amino acid by-pass due to not correcting microbial contamination were detected in both hays, with large variable errors among amino acids. A similar degradation pattern of amino acids was recorded in both hays. Cysteine, methionine, leucine and valine were the most degradation-resistant amino acids.

More information

Item ID: 26243
DC Identifier: http://oa.upm.es/26243/
OAI Identifier: oai:oa.upm.es:26243
DOI: 10.1071/AN11320
Official URL: http://www.publish.csiro.au/paper/AN11320.htm
Deposited by: Memoria Investigacion
Deposited on: 23 Jun 2014 16:56
Last Modified: 22 Sep 2014 11:40
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