| Autor: |
J. G. Linn, Marshall D. Stern, Martin Ruiz-Moreno, Alex Bach, M. Thrune |
| Rok vydání: |
2009 |
| Předmět: |
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| Zdroj: |
Livestock Science. 124:261-265 |
| ISSN: |
1871-1413 |
| DOI: |
10.1016/j.livsci.2009.02.007 |
| Popis: |
An experiment was conducted with eight ruminally-cannulated cows using a crossover design with 2 periods to determine the effects of yeast supplementation on rumen fermentation. Holstein dairy cows in late lactation were either supplemented with 0.5 g/hd/d of Saccharomyces cerevisiae, an active dry yeast (CNCM-1077, Levucell SC20 (r) SC, Lallemand Animal Nutrition) or not supplemented (control). A basal diet consisting of 60% forage and 40% concentrate (DM basis) was fed once daily to both groups of cows throughout the entire experiment. Ruminal pH was measured continuously every 22 min using a pH probe that was placed in the ventral rumen sac for 6 consecutive days. Volatile fatty acid and ammonia N concentrations in the rumen were measured on days 5 or 6 of the 12-d period for each cow and DM intake was monitored throughout the experiment. Data were analyzed using a mixed-effects model with repeated measures. There were no differences in dry matter intake between treatments. Mean ruminal pH was greater (P |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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