Gökkuşağı alabalığı (Oncorhynchus mykiss Walbaum, 1792) yeminde soya küspesi yerine susam (Sesamum indicum) tohumu küspesinin değerlendirilmesi

Abstract

A 60-day feeding trial was conducted to asses the potential nutritive value of sesame seed meal as a dietary replacement for soybean meal in the diets of rainbow trout ( Oncorhynchus mykiss Walbaum, 1792). All diets were prepared to be isonitrogenous (49% protein), isolipidic (19% lipid) and isoenergetic (22 kJ g-1). Four different diets containing 0% (C), 10% (10SSM), 15% (15SSM) and 20% (20SSM) sesame seed meal were formulated for rainbow trout with a mean weight of 81.02±0.02 g and fish were hand fed feed twice a day to apparent satiety under a natural light regime. At the end of study, significant differences were found in final body weight, weight gain and specific growth rate (SGR, %) between control group (C) and the experimental groups (p<0.05). While there were no significant differences between the experimental groups in terms of feed conversion ratio (FCR) and protein efficiency rate (PER) (p>0.05), Apparent Net Protein Retention (ANPR) differed significant between C and 10SSM and 15SSM and 20SSM groups (p<0.05). The moisture, protein, lipid and ash contents in the body composition of the fish increased in all experimental groups. The moisture, lipid and ash content were not significantly differed among the groups (p>0.05) but protein contents of fish in 15SSM and 20SSM groups was significantly higher than fish in control and 10SSM groups (p<0.05). There were also no differences in the digestibility of crude protein among groups (p>0.05). Comparable performance in growth, nutrient utilization and crude protein deposition of rainbow trout fed by diet containing 15% sesame seed meal showed that these meals could be used as this rate.