Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Effects of feed intake on in situ rumen microbial contamination and degradation of feeds
Year:2008
Research Areas
  • Animal production
Information
Abstract
An in situ study was conducted using four rumen cannulated wethers and five feeds (corn grain (CG), soybean meal (SBM), sunflower meal (SFM), vetch-oat hay (VH), and lentil straw (LS)) to determine (using 15N infusion techniques) the effects of two intake levels (40 and 80 g DM/kg W0.75) on the microbial contamination and rumen degradation of DM or CP. Degradation studies were also performed for neutral and acid detergent fibres (NDF and ADF, respectively) of VH. In most cases, the evolution with time of the microbial DM adhered to particles fitted well to exponential curves, which diverged between both levels of intake due to the lower values attained at high intake. However, as a consequence of the large and progressive increase of the variability of microbial contamination, statistical evidence is only partial. This behaviour was less evident for CP contamination, especially in forages. The lack of these corrections underestimated (P < 0.001) the effective degradability (ED) of all tested fractions, with important differences between feeds. The intake level had not relevant effects on the distribution of soluble, insoluble available and unavailable fractions of DM or CP (or fibres in VH), but determined some changes in their degradation rates (kd). Direct relations between these last values and rumen outflow rates (kp) were shown in some feeds for the degradation of CP and also of DM in concentrates, whereas negative relations were shown for the degradation rates of DM in forages (or NDF and ADF of VH). All ED estimates decreased with the intake rise, but for CP this effect (P<0.05) was only detected in SBM and VH and, as tendency (P = 0.079), in SFM. These decreases represent 40.8 (CG), 80.8 (SBM), 62.1 (SFM), 66.8 (VH), and 19.5% (LS) than those estimated considering only kp changes, which shows the interest to consider conjointly the variations of both rates to study the effect of diet changes on ED.
International
Si
JCR
Si
Title
Livestock Science
ISBN
1871-1413
Impact factor JCR
0,61
Impact info
Volume
116
Journal number
116
From page
108
To page
117
Month
ENERO
Ranking
Participants
  • Autor: Carlos Alberto Rodriguez Cortes (UPM)
  • Autor: Javier Gonzalez Cano (UPM)
  • Autor: Maria Remedios Alvir Morencos (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Producción Animal
  • Departamento: Producción Animal
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