Observatorio de I+D+i UPM

Memorias de investigación
Artículos en revistas:
In situ ruminal amino acid degradability of green and ensiled Italian rye-grass according to particle transit model and microbial contamination correction.
Año:2009
Áreas de investigación
  • Producción animal
Datos
Descripción
The ruminal degradation of amino acids (AA) of a green Italian rye-grass (GRG) and its silage (ERG) was determined on three wethers cannulated in rumen and duodenum using in situ and particle passage techniques. Wethers were fed a diet of ERG, corn silage and concentrate (1:1:1, DM basis) at 40 g DM/kg BW0.75. Two rumen incubations (at 0, 2, 4, 8, 16, 24, 48 and 72 h) with freeze-dried samples (3 g) in nylon bags were performed for each feed. The microbial contamination of incubated residues was corrected using 15N enriched solid associated bacteria isolates as reference. Two different estimates of undegraded AA were established: UPp, considering the particle rumen outflow rate (kp) of the ERG, and UPcp, considering additionally the rate of conminution and mixing (kc) of these particles. Microbial contamination resulted in large errors in the degradation kinetic parameters of all AA. As a result, non corrected UPp and UPcp included a large fraction of microbial origin. For essential AA plus cysteine these microbial proportions ranged 0.365-0.555 (UPp) and 0.461-0.710 (UPcp) in GRG. In ERG these values ranged: 0.403-0.666 (UPp) and 0.481-0.804 (UPcp). Cysteine always supplied minimum values whereas lysine showed maximum values in GRG or very close to these in ERG. Ensiling was associated with large changes in the AA profile. These variations conditioned, in turn, large differences in the changes made by the rumen microorganisms on the AA profile of both forages. However, ensiling only led to little changes in the profile of the rumen undegraded protein, especially when kc was considered. Results show the need to correct for this contamination to obtain accurate AA valuations and also that the AA profile of the undegraded protein of a green forage may serve as a guide for this profile in its silages.
Internacional
Si
JCR del ISI
Si
Título de la revista
Livestock Science
ISSN
1871-1413
Factor de impacto JCR
1,091
Información de impacto
Volumen
123
DOI
Número de revista
0
Desde la página
209
Hasta la página
214
Mes
ENERO
Ranking
Esta actividad pertenece a memorias de investigación
Participantes
  • Autor: Javier Gonzalez Cano (UPM)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Producción Animal
  • Departamento: Producción Animal
S2i 2022 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)