نوع مقاله : مقاله پژوهشی
نویسندگان
1 شیلات،دانشکده علوم دامی و شیلات، دانشگاه علوم کشاورزی و منابع طبیعی ساری
2 شیلات، دانشکده علوم دامی و شیلات، دانشگاه علوم کشاوری و منابع طبیعی ساری
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Fat powder, as a fat with saturated fatty acids, has low digestibility, so using suitable supplements might increase the possibility of replacing this fat source in the diet, so the aim of this study is to investigate the effect of supplementary taurine amino acid on growth, body composition and fat digestibility of rainbow trout (Oncorhynchus mykiss) fed fat powder. The experimental diets included a positive control containing fish oil, canola oil and other diets containing fat powder and taurine at levels of 0 (negative control), 5, 10, and 20 g/kg. A total of 225 rainbow trout (Oncorhynchus mykiss) with an average weight of 12.00 ± 0.03 g were randomly assigned to fifteen tanks for 58 days. The results showed that adding 20 g/kg taurine to the diet containing fat powder significantly increased the percentage of body weight gain and specific growth rate compared to the negative control diet without taurine (P<0.05). However, feed conversion ratio, feed intake, protein efficiency ratio, conditional factor, and fish survival were not affected by the experimental diets (P>0.05). Additionally, body protein and fat in fish fed with 20 g/kg taurine were higher compared to the negative control (P<0.05). Body ash in the positive control diet was significantly higher than that of the negative control (P<0.05). Furthermore, protein and ash digestibility were the highest in the 20 g/kg taurine treatments and the lowest values were observed in the negative control (P<0.05). Based on the results of this study, adding 20 g/kg of taurine as the optimal supplement level to a diet containing 70% fat powder in rainbow trout has significant positive effects on growth, body composition, and fat digestibility.
کلیدواژهها [English]
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