The Effect of the Stirring Speed on the In Vitro Dry Matter Degradability of Feeds

In vitro methods have been standardized and tested to correctly simulate the rumen environment fermentation process. A few studies verified that feed degradability achieved as a result of stirring samples is higher when are incubated under continuous than they only stirred twice daily. The objective this study has verify effect speed on during incubation. For purpose, apparent true dry matter (ADMD TDMD) grass hay, pelleted alfalfa, corn silage, barley meal, straw, total mixed ration (TMR) were measured after 48 h incubation in jars different rotation speeds. same types placed four each instrument, system machine was modified ensure simultaneous pair original (which sometimes stopped and/or rotated slowly irregularly) together with regular rotation. rev counter data logger mounted onto jars, speeds compared conditions (empty liquid, fluid, sample bags). modifications instruments stabilized thereby making more partly influenced by stirring, albeit just one for TMR. short, it found bags not essential obtain reliable measurement incubation, although better maintain constant process therefore allow reproducibility comparisons results degradability.