Effect of feeding cassava bioethanol waste on nutrient intake, digestibility, and rumen fermentation in growing goats.

Abstract

This experiment was conducted to investigate the effects of various levels of cassava bioethanol waste (CBW) on nutrient intake, digestibility, rumen fermentation, and blood metabolites in growing goats. Twelve crossbred, male (Thai Native × Anglo Nubian) growing goats with initial body weight (BW) of 20±3kg were randomly assigned according to a completely randomized design (CRD). The dietary treatments were total mixed ration (TMR) containing various levels of CBW at 0, 10, and 20% dry matter (DM). CBW contained crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), and acid detergent lignin (ADL) at 11, 69, 47, and 23% DM, respectively. The TMR diets were offered ad libitum and contained CP at 15% DM. Inclusion of CBW at 10% DM in TMR did not alter feed intake (g DM and g/kg BW(0.75)) and CP intake when compared to the control fed group (0% CBW). Total OM intake was lower in the 20% CBW group than in the others (P < 0.01). The digestibility coefficients of DM, OM, CP, and NDF were not changed for the TMR including 10% CBW compared to the control group (P > 0.05) whereas when 20% CBW was incorporated to diet, intermediate digestibility coefficients were decreased. Average ruminal pH values ranged from 6-7. Rumen NH3-N and PUN concentration at 0, 3, and 6h post-feeding were not significantly different among treatments (P > 0.05). Thus, inclusion of 10% CBW in TMR diets does not adversely affect nutrient intake, digestibility, rumen fermentation, and blood metabolite in fattening goats, and CBW may be effectively used as an alternative roughage source in the diets of goats.