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no acids, starch digestibility and true metabolizable energy in ground raw (RJB) and extruded (EJB) jackbean seeds. Three feeding methods were used: ad libitum feeding, dry and wet force feeding. Both RJB and EJB were tested alone or at 3 levels of inclusion, 10, 30 and 50%, in combination with maize starch or yellow maize. The results indicated that extrusion significantly increased amino acid digestibility from 73.6% in RJB to 94.0% in EJB. Similarly, starch digestibility was found to be 65.2% and 96.0% for RJB and EJB respectively, using a force feeding technique of pure bean meal. True metabolizable energy content of EJB varied from 2900!200 kcal/kg on a dry matter basis, and was 400-600 kcal/kg higher than that of RJB depending on the method used. Toxicity of JB proved to strongly decrease voluntary food intake and justify the use of different experimental approaches to ascertain the metabolizable energy value. These data confirmed the potential value of JB as a feedingstuff for poultry and also indicate that extrusion may represent a practical method for improving digestibility of its nutrients by 20% for amino acids and 30% for starch.

Amino acids and starch digestibility and true metabolizable energy content of raw and extruded jackbeans (Canavalia ensiformis) in adult cockerels