| The research, by adding sodium selenite and Selenium-Enriched Yeast as the sources of selenium to the daily dietary, was to study the effect of different sources of selenium on growth performance, immunological index and the utility ratios of selenium in weaned piglet. Forty crossbred piglets Yorkshire×Landrace×Duroc(DLY) weaned at aged 28 days (weight 7.17±0.11Kg )were used as animal models. A signal factor design was employed with the supplementation of 0.3mg/kg selenium in four treatments: group S-Se (source of sodium selenite) 0.3mg/kg, group S-Se 0.2mg/kg+Y-Se (source of Selenium-Enriched Yeast) 0.1mg/kg, group S-Se 0.1mg/kg+ Y-Se 0.2mg/kg and group Y-Se 0.3mg/kg. ADFI, ADF and F/G, diarrhea index; serum titer of IgA, IgG, IgM and T-lymphocyte transformation ratio; content of selenium in feed material, daily dietary, feces, urine; utility ratios and accumulation of selenium in the body were counted. The data were analyzed using one-way analyses of variance procedures (ANOVAs) and LSD's multiple range tests by SPSS 11.5.Results of this research indicated as follows:With the ratio of Y-Se increasing, ADFI and ADF showed a trend of increase while F/G and diarrhea index showed a trend of decrease. Seen from the whole period, ADFI of group Y-Se 0.3 was significantly higher than that of group S-Se 0.3, 403.62±5.69g, 431.96±9.64g respectively; while other indexes showed no significant differences.Compared with group S-Se 0.3, group Y-Se 0.3, of which IgA increased by 18.6 % (P<0.01) , IgG increased by 3.7% ,and IgM increased by 8.7% , showed a trend of increase; T-lymphocyte transformation ratio increased by 31.1% (P<0.01) .With the ratio of Y-Se increasing, the apparent digestion of Se, the apparent absorption of Se and the retention to weaned piglet increased significantly, group Y-Se 0.3 and group S-Se 0.3, 65.72±2.24% and 75.58±0.96%,39.47±3.02% and 70.08±1.13%, 26.09±2.71% and 52.97±1.2% respectively.
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