Effect of different selenium source (sodium selenite and selenium yeast) on broiler chickens

A feeding experiment was carried out to compare the effects of supplementing a poultry meal-based diet with selenium as sodium selenite or selenium yeast on broiler chickens. Three groups with three replicates of broiler chickens (mean weight 710 +/- 5.3 g) were given a basal diet either unsupplemented (control) or supplemented with 0.2 mg Se kg(-1) as sodium selenite (trial 1) or selenium yeast (trial 2) respectively, for 21 days. There was significant difference (P<0.05) in Feed Conversion Ratio (FCR) of trials 1 and 2 compared with the control. However, there were no significant differences (P>0.05) in FCR between trials 1 and 2. Final weight, survival rate and Daily Gain (DG) were not affected by the dietary Se source. Chickens fed the basal diet showed lower (P<0.05) selenium content in muscle, kidney, liver and pancreas compared to that fed selenium supplements (trials 1 and 2). Furthermore, trial 2 showed the highest value (P<0.05) among these treatments. However, there was no significant difference (P>0.05) in muscle selenium content of chickens between trials I and 2. Glutathione peroxidase (GSH-Px) activities in broiler chickens plasma and liver of all selenium treatment groups (trials 1 and 2) were significantly different (P<0.05) from that of the control. The GSH-Px activity in plasma was higher (P<0.05) in trial 2 compared with trial 1 and the control. However, there was no difference (P>0.05) in hepatic glutathione peroxidase between trials 1 and 2 although the average value of GSH-Px activity in trial 2 presented the trend of increase. (C) 2007 Elsevier B.V. All rights reserved.