Effects of different selenium sources on tissue selenium retention and anti-oxidative activities in weaned piglets

A total of 32 weaned piglets(Duroc×Landrace×Yorkshire)with body weight of 15 kg were allotted to the 4 groups in a randomized complete block design,of which 3 were assigned for test groups,and one served as control.Three different selenium sources namely selenium-enriched probiotics,selenium-enriched yeast,and sodium selenite were respectively supplemented to 3 test groups in a dosage of 0.3 mg selenium per kilogram diet.Whole feeding experiment lasted for 60 days.The results were as follows:(1)Contents of the muscle,kidney and liver selenium in 3 test groups were very markedly higher than control group(P0.01)in the end of the experiment;(2)In the 30th day and 60th day of the experiment,blood GSH-Px activity,blood selenium concentration,serum SOD activity in 3 test groups were markedly or very markedly higher than control group(P0.05 or P0.01),serum MDA levels were markedly lower than control group(P0.05);(3)Weaned piglets performance was markedly enhanced by selenium-enriched probiotics in the experiment(P0.05).