During recent years, yeast culture and fibrolytic enzymes have been used to improve the nutritive value and utilization efficiency of poor quality roughages. Fibrolytic enzymes and yeast culture supplementation in ruminant diets can increase DMI, production performance, cellulose degradation, and nutrient digestibility. Yeast culture (Saccharomyces cerevisiae) has been extensively used as a dietary supplement in ruminants. The benefits associated with S. cerevisiae include increased DM and NDF digestion, increased initial rate of fiber digestion, improved in situ CP and NDF degradation and microbial efficiency, and increased DMI and milk production. The book 'A step Ahead in Ruminant Nutrition' deals with the effect of direct addition of fibrolytic enzymes preparation and/or yeast culture to groundnut haulms based TMR on nutrient utilization and rumen fermentation metabolites in graded Murrah buffalo bulls.