Abstract:Apparent digestibility coefficients (ADCs) of dry matter, crude protein, crude lipid, gross energy, phosphorus and amino acids in white fish meal, Peruvian red fish meal, meat and bone meal, corn gluten meal, soybean meal, peanut meal, cottonseed meal, and rapeseed meal were determined for juvenile tiger puffer (Takifugu rubripes) with initial mean body weight of 37.90 g. A reference diet and test diets that consisted of a 70 : 30 mixture of the reference diet to test ingredient were used with 0.1% Y2O3 as an external indicator. White fish meal, Peruvian red fish meal and soybean meal had higher ADCs of dry matter, dry matter ADCs ranged in 43.35%~70.54% among ingredients tested. Protein ADCs of feed ingredients ranged in 50.91%~92.78%, meat and bone meal had significantly lower ADCs of protein compared with that of white fish meal, Peruvian red fish meal, soybean meal, peanut meal, rapeseed meal and distillers dried grains with solubles (DDGS) (P<0.05). Amino acid ADCs generally reflected protein digestibility. ADCs of lipid were relatively high in the ingredients tested. Energy ADCs of feed ingredients ranged in 30.58%~90.01%, white fish meal, Peruvian red fish meal, soybean meal and peanut meal had significantly higher ADCs of energy (76.26%~90.01%). Phosphorus ADCs of feed ingredients ranged in 9.13%~68.14%, white fish meal, Peruvian red fish meal had significantly higher ADCs of phosphorus among ingredients tested. In conclusion, ADCs of dry matter, crude protein, crude lipid, gross energy, phosphorus and amino acids in white fish meal, Peruvian red fish meal were higher, while ADCs of dry matter, crude protein, crude lipid, gross energy, phosphorus and amino acids in meat and bone meal and DDGS were lower compared with that other tested ingredient for tiger puffer. Soybean meal and peanut meal had higher ADCs of protein and essential amino acids in plant protein ingredients. Resultant digestibility data may provide useful information to commercial tiger puffer feed industry.
