Partial Replacement of Soybean Meal by Peanut and Sesame Seed Meals in Practical Diets for Rainbow Trout, Oncorhynchus mykiss

Abstract

This study was conducted to evaluate the partial replacement of soybean meal by sesame seed and peanut meals in practical diets for rainbow trout (Oncorhynchus mykiss). Four isonitrogenous (44% protein) and isolipidic (19% lipid) diets were formulated. The trial diets were prepared to include 10% sesame seed meal (S10), 10% peanut meal (P10), 5% sesame seed meal+5% peanut meal mix (SP10) and a control (C) with no replacement of soybean meal. There were four dietary treatments, with three replicates for each treatment. The fish (initial average weight; 79.86±0.14 g) were hand-fed twice a day to apparent satiety under a natural light regime for 65 days. At the end of experiment, the best growth was determined in SP10 group (p<0.05). The growth performance of S10 and P10 groups was significantly lower than control and SP10 groups (p<0.05). The hepatosomatic index (HSI) and viscerosomatic index (VSI) values were not affected from the protein sources in the diets (p>0.05). Comparing to the initial sample, the moisture, protein, lipid and ash contents in the body composition of the fish increased in all experimental groups and were not significantly differed among the groups (p>0.05). In the crude protein digestibility was no differences in among groups (p>0.05), but the highest apparent protein digestibility coefficients were determined for C (91.26%) and SP10 (91.93%) groups. The present results demonstrated that 10% sesame seed meal and peanut meal could be used in diets of rainbow trout without any negative effects on growth. The results showed that using these protein sources together may provide better results rather than using them alone. Keywords: