نوع مقاله : مقاله پژوهشی
1 گروه بهداشت و بیماریهای آبزیان، دانشکده علوم تخصصی دامپزشکی، واحد علوم و تحیقات، دانشگاه آزاد اسلامی، تهران، ایران.
2 گروه کنترل کیفی مواد غذایی، دانشکده علوم تخصصی دامپزشکی، واحد علوم و تحیقات، دانشگاه آزاد اسلامی، تهران، ایران.
عنوان مقاله [English]
This study examined the effects during 56 days of feeding of three dietary probiotics on growth performance and feed utilization, intestinal colonization and related health criteria in Oncorhynchus mykiss (rainbow trout). This study included 3 groups: a control group of fish, and fish fed with a basal commercial diet supplemented with 2.5 × 108 CFU g–1 Enterococcus faecium strain IR5 (group 1) (was micro-encapsulated with sodium alginate) and 1 × 109 CFU g–1 Enterococcus faecium strain IR5 (group 2) (was micro-encapsulated with sodium alginate)singularly in triplicate. 270 rainbow trout with an average weight of 35.6 ± 3.8 g (mean±SD) were obtained. Fish were acclimatized for 20 days. The probiotics groups showed improvement with respect to weight gain (WG), body weight index fish (BWI) (%), total length (TL), specific growth rate (SGR), feed conversion ratio (FCR), protein efficiency ratio (PER), lactic acid bacteria (LAB) (%) in intestinal, intestinal colonization (log CFU g–1) and survival (%). At 28 days, group 2 showed improvement with respect to growth performance and feed utilization, intestinal colonization and related health criteria were higher than other groups. At 56 days, the WG and PER in the group 1 were significantly higher than in 2 and control groups (P<0.05). The LAB (%) in intestinal was higher in group 2 than in 1 and it was higher in group 1 than in the control groups after 8 weeks feeding (P<0.05).