Albaraa Sarsour

INTRODUCTIONTryptophan (Trp) is an essential amino acid and third limiting in typical commercial corn-soybean diets for white egg-laying hens (Russell and Harms, 1999). Tryptophan is primarily used for protein synthesis to maintain egg production but also plays a role as a precursor of serotonin which is synthesized to melatonin to regulate sleep, appetite, and stress responses. In addition, Trp c ...

Sorghum can be utilized to replace corn in areas where corn is not readily available. Serine protease has been proposed to improve the digestibility of sorghum because it could degrade disulfide bonds of kafirin proteins. One experiment was conducted to evaluate the effects of sorghum inclusion level and the addition of a serine protease on chicken live performance from 1 to 35 d of age. Eight tre ...