Utilization Of Animal Protein Sources For Juvenile Hybrid Tilapia, Oreochromis Niloticus × O. Aureus

Two animal protein sources such as meat and bone meal, fish(hybrid tilapia) by-product were measured on juvenile hybrid tilapia (Oreochromis niloticus×O.aureus).In the research,Two experimental diets were desined.Both isonitrogenous and isolipidic diets were formulated to contain seven graded levels of animal protein sources(meat and bone meal and fish by-product) respectively, such as 0, 5%, 10%, 15%, 20%, 30%, 40%. In control groups, cottonseed meal, rapeseed meal, soybean meal and peanut meal were used as protein souces, and fish oil and soybean oil were mixed 1:1 as lipidic souces. Juvenile hybrid tilapia (Oreochromis niloticus×O.aureus) mean were fed with two experimental diets for a 8-week period in the non-indoor cuture system, and study the effect of different concentration of meat and bone meal and fish by-product in diets on growth, feed utilization, body composition and morphological indexes for juvenile hybrid tilapia(Oreochromis niloticus×O. aureu). in order to determined the optimum level of meat and bone meal and fish by-product can be included in diets.The results can bebriefly summarized as follows:1. Compared to control group, fish fed diets in which 10% of meat and bone meal showed equivalent final body weight, weight gain, feed conversion ratio, specific growth rate and protein efficiency ratio. However, increasing replacement level of SBM protein by meat and bone meal up to 10%, the final body weight, weight gain, pecific growth rate and protein efficiency ratio were singnificantly affected, with the final body weight, weight gain, pecific growth rate and protein efficiency ratio declined, and feed conversion ratio increased. With the inclusion levels of meat and bone meal increased, the morphological indexes such as viscerasomatic index, condition factor, and hepatosomatic index were not significantly affected. No significant differences were observed in the fat, ash content of whole body and ash, moisture content of dorsal muscle, regardless of dietary treatment; while the moisture, protein content of whole body were significantly effeced, the moisture content of whole body was significantly among the tested diets with no special trend. Fat content of dorsal muscle significantly decreased with the inclusion levels of met and bone meal increased. The results obtained showed that meat and bone meal can be utilized in hybrid tilapia diets a levels up to 10% (diet 10%) without negative effects on growth, morphological indexes and body composition (i.e., fat and ash content).2. The result of this study showed that fish fed the tested diets showed equivalent final body weight, weight gain, feed conversion ratio, specific growth rate and protein efficiency ratio.With the inclusion levels of fish (hybrid tilapia) by-preduct increased, the morphological indexes such as viscerasomatic index, condition factor showed a declined trend and increased trend, respectively, and hepatosomatic index were not significantly affected among the tested diets. No significant differences were observed in the fat, ash content of whole body and ash, moisture content of dorsal muscle, regardless of dietary treatment; while the moisture, protein content of whole body were significantly effeced, the moisture content of whole body was significantly between the tested diets with no special trend.When the inclution of fish by-preduct in the diets up to 40%, the protein content of whole body and fat content of dorsal muscle were significanly increased and decreased.The results obtained showed that the fish(hybrid tilapia) by-product can be utilized in hybrid tilapia diets a levels up to 40% (diet 100%) without negative effects on growth, hepatosomatic index and body composition (i.e., fat and ash content).