Effects of extruded and pelleted diets with differing protein levels on growth and nutrient retention of tilapia, Oreochromis niloticus × O. aureus

The present study was conducted to evaluate the effects of extruded diets and pelleted diets with varying protein levels on growth performance and nutrient utilization of tilapia. Six diets, containing three levels of crude protein (CP) of 250, 280 and 310 g kg−1, were prepared by pelleting (sinking) or extruding (floating) and were fed to tilapia juveniles (body weight of 8.0 ± 0.1 g). After 8-week feeding, the weight gain (WG) and feed...