The chemical composition and energy value of guava and tomato wastes for broilersat different ages were determined in this research. The metabolism assays werecarried out by using the methodology of total excreta collection to calculatethe chemical composition of wastes collected in different months. A total of270 COBB broiler chicks was used: 150 in the period from 1 to 8 days of age(phase 1) and 120 chicks were used in the period from 10 to 17 days of age (phase2). The trials were analyzed as completely randomized design with three treatmentswith five replications of 10 and 8 birds at the respective ages. The treatmentsconsisted of different diets: one reference diet, one with 30% tomato meal andanother with 20% guava meal, both partially replacing the reference diet. Thevalues of the chemical composition of guava and tomato wastes varied accordingto the collection season. The chemical composition indicated that the wastescan be used in poultry feed, but with high crude fiber contents. The valuesof apparent metabolizable energy and nitrogen-corrected apparent metabolizableenergy and of gross energy metabolizability coefficient of guava waste was notaffected by the birds age, different from the result observed for tomato waste,whose digestibility coefficients and apparent metabolizable energy values variedamong growing phases. The apparent metabolizable energy values (AME) for broilersform 1 to 8 and from 10 to 17 days of age were 1,331 and 1,358 kcal/kg for guavawaste and from 2,351 to 2,465 kcal/kg for tomato waste.
