A survey on the Effect of Bovine Lactoferrin on the Growth Parameters of Rainbow Trout (Oncorhynchus mykiss)

In this study, the effect of bovine lactoferrin (Lf) on growth parameters of rainbow trout (Oncorhynchus mykiss) were investigated. Fish with mean body weight of 40±5 g were fed for 30 days on three feeding regimes (1) commercial diet supplemented with 200 mg Lf/kg (2) commercial diet supplemented with 100 mg Lf/kg, (3) commercial diet without Lf. Growth and nutritional parameters were measured at the end of the experiment. Results revealed that the fish in all experimental treatments fed by LF, had significantly higher SGR, weight gain and lower FCR compared to the fish in control group (P <0.05). Fish fed on the diet containing 200 mg LF/kg exhibited higher growth parameters except condition factor, but no significant differences were observed with the group fed on diet supplemented with 100 mg LF/kg (P>0.05). The results indicated that use of 100 mg Lf/kg diet is highly recommended for feeding rainbow trout.