Effects of dietary propolis and vitamin E on growth performance and antioxidant status in blood of juvenile Rainbow trout, Oncorhynchus mykiss (Teleostei: Salmoniformes) under different flow rates

Abstract

The present study investigated the effects of propolis and vitamin E supplementation in diets of juvenil rainbow trout subjected to two different flow rates with or without flow stress (0.9 and 2.1 l/min, respectively) on final weigth (FW), condition factor (CF), feed conservation ratio (FCR), protein efficiency ratio (PER) and vitamin A, C and E concentrations and malondialdehyde (MDA) levels in serum as well as plasma superoxide dismutase (SOD) activity. The experimental groups were as follows: group C was fed a basal diet, group P10 was fed a basal diet supplemented with 10 g propolis/kg, group P30 was fed a basal diet supplemented with 30 g propolis/kg, group E60 was fed a basal diet supplemented with 60 mg vitamin E/kg. CF and PER were not different among all diets groups for both flow rate treatments (p > 0.05). The FCR improved in P10, P30 and E60 diet groups compared to C diet group at 2.1 l/min flow rate (p < 0.05). The FCR of E60 and P30 were found to be better than C and P10 diet groups at 0.9 l/min flow rate (p < 0.05). Vitamin E and propolis supplementations did not affect vitamin A concentration of serum for either flow rate (p > 0.05). Fish fed with diet E60had higher serum vitamin E concentration than other groups (p < 0.05). Serum Vitamin C concentration was only affected by the propolis supplemented diets. MDA level of E60 group was found significantly lower comperad to other groups for both flow rate (p < 0.05). Plasma SOD activity significantly decreased in the E60 group compared to other groups at 2.1 l/min flow rate (p < 0.05). But plasma SOD activity was not different among all diets groups at 0.9 l/min flow rate (p > 0.05)

Vitamin E supplementation in diet ameliorates growth of Nile tilapia by upgrading muscle health

“…Dietary supplementation of VE improved the feed efficiency of soft–shell turtle, Pelodiscus sinensis ( Huang and Lin, 2004 ), which is consistent with our results. Several studies revealed that VE supplementation through diet improved the production and feed efficiency of parrot fish Oplegnathus fasciatus ( Galaz et al, 2010 ), Rainbow trout Oncorhynchus mykiss ( Kelestemur et al, 2012 ), zebrafish Danio rerio ( Mehrad et al, 2012 ), yellow catfish Pelteobagrus fulvidraco ( Lu et al, 2016 ), turbot Scophthalmus maximus ( Niu et al, 2014 ), channel catfish Ictalurus punctatus ( He et al, 2017 ) and largemouth bass Micropterus salmoides ( Li et al, 2018 ). The growth improvement could be a reflection of better utilization of essential nutrients, which may be attributed to enhance intestinal height and mucosal thickness ( He et al, 2017 ), stimulate the digestive and absorptive capability of host fish ( Farhangi and Carter, 2001 ).…”

Comparative Analysis between Synthetic Vitamin E and Natural Antioxidant Sources from Tomato, Carrot and Coriander in Diets for Market-Sized Dicentrarchus labrax

“…Overall, studies concerning the antioxidant effects of vitamin E of commercial-sized European sea bass are rare. Silva et al [114] recommended a dosage of 500 mg kg −1 of vitamin E for adult sea bass. However, data obtained in this study suggests that a 500 mg kg −1 inclusion of vitamin E (VITE diet) in European sea bass feeds have no beneficial effect on muscle antioxidant potential compared to the traditional dosage of 100 mg kg −1 (CTRL diet).…”

Dietary Brown Propolis Extract Modulated Nonspecific Immune System and Intestinal Morphology of Pacu Piaractus mesopotamicus

“…For instance, dietary propolis extracts (aqueous or ethanolic) increased serum lysozyme and immune cells production and activity of tilapia species such as Mozambique tilapia Oreochromis mossambicus [19] and Nile tilapia [15,35] as well as for rainbow trout [22,36,37], common carp [23] and Japanese eel [24]. In addition, propolis also mitigated toxic effects and oxidative stress in fish exposed to exogenous chemical compounds or environmental stress [20,25,[38][39][40].…”