Effects of the Level of Dried Cassava Pulp from Ethanol Process in the Ration on Rumen Fermentation and Digestibility in Fistulated Thai Native Bull

Abstract

The objective of this study was conducted to determine the effects of the level of dried cassava pulp from ethanol process (DCP) in the ration on digestibility and rumen fermentation in 4 fistulated Thai native bulls. The study was used Crossover Designs. The dietary treatments were divided into 4 treatments that are control diet (DCP 0) and the other 3 treatments were diets in which energy source was replaced by DCP at 15, 30 and 45%, respectively (DCP 15, 30 and 45). The results showed that the digestibility of dry matter (DMD), crude protein (CPD), neutral detergent fiber (NDFD), acid detergent fiber (ADFD) and nitrogen free extract (NFED) were not significant different among groups (P > 0.05). But the ether extract digestibility (EED) of DCP 0 was significant higher than DCP 30 (P < 0.05). Rumen pH and ammonia-nitrogen of each treatment was not significantly different (P>0.05). Ammonia-nitrogen in each treatment following the same trend i. e. increased at 1 hour after feeding then decreased at 2, 3 and 4 hour after feeding. In situ DM at 24 and 48 hour of DCP 0 and DCP15 were significantly higher than DCP 45 (P < 0.05). However, degradation rate and effective degradation at 0.05 fraction/hour were decreased with the increasing of DCP levels. Gas production at 16 and 24 hours of DCP 0 were significantly higher than DCP 45 (P < 0.05). Finally, TDN and ME of DCP 15 were higher than other groups so it could be concluded that DCP at 15 percentages would be suitable in the ration for beef cattle.