Effect of ash from different residual biomass used to obtain renewable energy on ruminal fermentation of diets based on wheat straw in batch cultures

The biomass-based renewable energy production generates big amoun ts of ashes. The recycling of these ashes is of environmental and economical importance. The aim of the present work was to study the effect of adding ash from different residual biomass (wood, ol ive oil extraction, winery and greenhouses wastes) on ruminal fermentation of wheat straw (WS) and wheat st raw plus concentrate (WSC). Batch cul- tures of mixed rumen micro-organisms were used. The ruminal inoculum wa s obtained from 3 rumen-fistu- lated Granadina goats. The kinetic of gas production (GP) was evaluated by following an exponential model