Two experiment were done to measure the effects of physical, chemical and enzymatic treatments of Rapeseed Meal (RSM) on Nitrogen (N) digestibility and True Metabolizable Energy (TME) in broilers and broiler chicks performance. In experiment 1, a precision fed-assay was used in which different RSM samples containing untreated RSM treated with autoclave, Hydrochloric acid (HCl), sodium hydroxide (NaOH) and Grindazyme GP were precise-fed (25 g) to male broilers (49 days old). Precision-fed assay indicated that N-digestibility and TME of all treated RSM were similar to untreated RSM (p>0.05) with the exception of autoclave treated RSM which was lower (p<0.05). On the basis of results of experiment 1 experiment 2 was designed to investigate the optimum level of RSM treated with Grindazyme GP on performance, breast, abdominal fat, pancreas, liver and gizzard weight for broiler chicks. Experimental diets were based on soybean meal (control diet) which was replaced by 0, 10, 15, 20, 25 and 30% enzyme treated RSM (0.03%). Over all live weight gain and feed intakes of all diets containing treated RSM were similar to control diet (p>0.05) but the broilers on 0, 25 and 30% RSM had significantly (p<0.05) better feed conversion ratio compared to the 20% level of RSM. Finally, the data suggest that up to 30% inclusion of enzyme treated RSM could be recommended for practical diet formulation.

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