Apparent digestibility of the energy and nutrients of conventional and alternatives foods for Nile Tilapia (Oreochromis niloticus)

The trial aimed to evaluate the apparent strain digestibility coefficients (CDa) of dry matter (MS), gross energy (EB) and crude protein (PB) of soybean meal (FS), corn (MO), wheat (TG), wheat meal (FT), millet pearl (MT), triticale (TC), cassava meal (FM) and soybean oil (OS) of Nile tilapia fingerlings of Thai. One hundred sexual reverted animals were used, with a mean weight of 37.61 +/- 4.98g, distributed in two alimentation 500L mansory tanks and feces collect in modified Guelph system in two 150L aquariums. CDa was determined by an indirect method, with 0.1% chromic oxide (Cr2O3) as marker. CDa of MS, PB and EB was 65.49, 89.58 and 71.38 for FS; 73.22, 93.40 and 76.63 for MO; 86.51, 96.30 and 87.07 for TG; 66.79, 91.00 and 68,81 for FT; 77.96, 94.91 and 89.12 for MT; 68.51, 94.78 and 80.55 for TC; 91.11, 97.52 and 91.40% for FM, respectively, and for EB of soybean oil 89.85%, the values of digestible protein (%) and energy (kcal/kg) were 42.19 and 3057.63 for FS; 7.18 and 3037.03 for MO; 11.01 and 3423.66 for TG; 13.44 and 2825.88 FT; 13.88 and 3755.55 MT; 13.74 and 3230.69 for TC; 1.76 and 3280.09; for FM and 8485.28 kcal/kg of energy digestible for OS. The results showed that the protein and energy of these foods are efficiently used by Nile tilapia. To formulate complete diets the digestible protein and energy values must be used.