Effect of the grass silage particle size offered as TMR
on the ruminal thiamine concentration
in high-yielding dairy cows

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.

CITATIONS (2):

Relationship between thiamine concentration and fermentation patterns in the rumen fluid of dairy cows fed with graded concentrate levels
M. Tafaj, M. Schollenberger, J. Feofilowa, Q. Zebeli, H. Steingass, W. Drochner
Journal of Animal Physiology and Animal Nutrition

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Effects of particle size of a total mixed ration on in vivo ruminal fermentation patterns and inocula characteristics used for in vitro gas production
M. Tafaj, Q. Zebeli, B. Junck, H. Steingass, W. Drochner
Animal Feed Science and Technology

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1230-1388

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