title: The tryptophan requirement of broiler chicks.
abstract: The "available" tryptophan requirements of male and female broiler chicks were determined at 7-d intervals from 0 to 56 d, using a diet-dilution technique. Availability of tryptophan in the diets was estimated by growth assay with chicks. 2. The tryptophan requirements were 2.4 (males) and 2.2 g/kg of diet (female) from 0-7 d, and 1.7 g/kg (males and females) from 7-35 and 35-56 d. The absolute requirement of the chick for tryptophan increased with age and was significantly different for male and female birds. 3. A highly significantly predictive equation relating tryptophan requirement to mean body weight and gain was established.
mesh_terms: D000367:Age Factors; D000821:Animal Feed; D000818:Animals; D001835:Body Weight; D002645:Chickens / Q000254:growth & development / Q000378:metabolism*; D005260:Female; D008297:Male; D009751:Nutritional Requirements; D014364:Tryptophan / Q000378:metabolism*
chemical_list: D014364:Tryptophan