This study determined the pre-caecal digestibility of crude protein (CP), amino acids (AA), gross energy, phosphorus (P) and pre-caecal phytate (InsP6) disappearance of a dehulled and ethanol-extracted rapeseed kernel meal (RKM) without and with exogenous phytase in broiler chickens.2. The experiment utilised a 3 × 2 factorial design with the factors RKM inclusion (0, 12.5 or 25%) and phytase supplementation (0 or 1500 FTU/kg). Diets were fed to Ross 308 broiler chickens from 16 to 21 d of age raised in floor pens (seven per diet).3. The RKM inclusion decreased the digestibility of certain AA (p p 6 disappearance decreased without phytase and increased with phytase (RKM × phytase: p p p p < 0.05). Crude protein and AA digestibility of the RKM was high and increased with phytase supplementation. The P from RKM was not digestible without phytase.
Klötzer et al. (Mon,) studied this question.