Effect of Yeast-fermented Bio-ethanol Waste on Feed Intake, Digestibility and Rumen Fermentation in Thai Native Cattle

Abstract

The purpose of this study was to determine level of bio-ethanol waste fermented with
Saccharomyces cerevisiae (yeast-fermented bio-ethanol waste, YEW) in total mixed ration (TMR) for Thai
native cattle. Four female Thai native cattle with 140±5 kg initial body weight were randomly allotted
according to a 4x4 Latin Square Design. Four dietary treatments were TMR containing YEW at 0, 10, 20 and
30%. The results showed that increasing levels of YEW in TMR were not affected feed intake (P>0.05), but
digestion coefficients of DM, OM, CP, NDF and ADF were linearly decreased (P<0.05). Moreover,
metabolizable energy of TMR was linearly decreased as YEW was increased (P<0.01). Furthermore, levels
of YEW in TMR were not affected ruminal pH, ruminal NH3-N and blood urea nitrogen of Thai native cattle
(P>0.05). However, it was found that total volatile fatty acids, propionic acid and butyric acid were no
significant different by increasing YEW level (P>0.05), but acetic acid and acetic: propionic acid ratio were
cubically increased by increasing level of YEW in TMR. In conclusion, this experiment indicated that
optimum level of YEW used in TMR for Thai native cattle was 10%.