Abstract
Nutrient digestibility and amino acid availability were assessed in tilapia, Oreochromis niloticus (L.), fingerlings fed diets containing soybean flour (SF): poultry meat meal (PMM) blends (25:75, 50:50 and 75:25), and 0.5 or 1.0% Cr2O3. Although there was variability in individual amino acid availability, average availability was in agreement with the pattern of overall protein digestibility. The best lipid, protein digestibility and amino acid availability values were obtained in the 75:25 SF:PMM blend and 0.5% Cr2O3 treatment, which corresponded to the lowest level of faecal crude protein while the best ash digestibility was observed with 25:75 SF:PMM blend and 1.0% Cr2O3. Chromic oxide inclusion level appeared to affect nutrient availability. Increased marker level might have resulted in decreased nutrient digestibility coefficients. Protein and lipid of diets containing more soybean flour seemed to be more digestible than those of poultry meat meal while the reverse was the case for ash.
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