Effect of the grass silage particle size offered as TMR on the ruminal thiamine concentration in high-yielding dairy cows.
- Publikations-Art
- Kongressbeitrag
- Autoren
- Tafaj, M., Zebeli, Q., Schollenberger, M., Junck, B. and Drochner, W.
- Erscheinungsjahr
- 2004
- Veröffentlicht in
- J. Anim. a. Feed Sci.,
- Herausgeber
- Danish Institute of Agricultural Sciences, Foulum
- Seite (von - bis)
- 219-222
- Tagungsname
- Symposium on Ruminant Physiology
- Tagungsort
- Kopenhagen, Dänemark
- Tagungsdatum
- 30.08.-04.09.2004
- Schlagworte
- dairy cow, particle size, rumen digesta, thiamine
The thiamine concentration was studied in solid and fluid rumen digesta of three Holstein cows, fitted with rumen cannulae and fed grass silage-based TMR with three particle sizes (25, 11 and 5.5 mm). The decrease of the particle size led to an increase of the thiamine concentration in solid (P<0.05) and fluid rumen digesta. Thiamine concentration was increased (R2=0.56, P<0.001) as digestible organic matter intake increases. The pH (mean 5.81) did correlate negatively (R2=0.21 to 0.26, P<0.001) to the thiamine concentration of rumen. Thiamine concentration of the rumen digesta did reflect in great extent the changes of rumen conditions.