نوع مقاله : مقاله کامل علمی - پژوهشی
نویسندگان
1 دانشجوی کارشناسی ارشد رشته علوم مهندسی شیلات، گروه شیلات، دانشکده شیلات و محیط زیست، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، ایران
2 گروه شیلات، دانشکده شیلات و محیط زیست، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران.
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
The present study was designed to investigate the effect of a diet containing hydroalcoholic extract of savory (Satureja hortensis) on the growth performance and innate immune response of skin mucus and serum in rainbow trout (Oncorhynchus mykiss). For this purpose, 240 rainbow trout juveniles with an average weight of 2.02 ± 0.02 grams were randomly distributed into 4 experimental groups with three replications and fed diets containing concentrations of 0 (control), 0.1%, 0.5%, and 1% hydroalcoholic extract of savory for a period of 6 weeks. The results showed that growth performance indices, including final weight and weight gain, significantly increased in the group fed with a diet containing 1% savory extract compared to the control group. However, a significant difference in the specific growth rate index was not observed between the extract-fed groups and the control group. Analysis of serum immune indices showed that lysozyme activity increased in the groups fed with different levels of savory extract compared to the control group, while alkaline phosphatase, aspartate aminotransferase, and alanine aminotransferase activities decreased. Analysis of mucosal innate immune indices also showed that the highest activities of lysozyme and alkaline phosphatase enzymes were associated with the groups fed diets containing 0.5% and 1% savory extract, respectively. The protein concentration in the solution was not affected by the consumption of the extract-containing diet. Therefore, dietary supplementation with hydroalcoholic savory extract, especially at a level of 1%, can serve as a natural feed additive to improve the growth and health of rainbow trout juveniles.
کلیدواژهها [English]