Possibility to improve rice polishing utilisation in broiler diets by enzymes or dietary formulation based on digestible amino acids

The effect of 500 FTU phytase/kg, and 500 U phospholipase A(2)/kg, or their combination or formulating the diet based on true digestible amino acid (TAAD) on improving utilisation of diet containing 15% in grower and 20% in finisher diet of rice polishing (15/20% rice polishing) was investigated in trial (1). The effect of phytase alone when added to broiler diets containing either 10/15% or 20/30% rice polishing, or a combination of 500 FTU of phytase and 1 g/kg of multienzymes mixture (Optizyme (R)) to 20/30% rice polishing diet was studied in trial 2. Including rice polishing at 15/20% in trial 1 or 10/15% in trial 2 in the diet for broilers did not affect BWG and FCR, therefore enzymes or dietary formulation based on TAAD showed no positive impact. In trial 2, rice polishing at 20/30% in broiler diets significantly reduced BWG and FCR, whilst phytase or phytase + multienzymes mixture partially improved growth performance, though the combination yielded superior effect. Phytase significantly improved apparent digestibility of CP, and consequently increased plasma protein and CP of meat.