The Effects Of Different Se Source On Growth And Bioavilability In Broilers

This study was conducted with broilers to evaluated sodium selenite and se-enriched yeast source at various dietary se levels on broiler performance , blood glutathione peroxidase activity , tissue se concentrations and Se apparent retention et al. In this experiment, se was added to dietary by 0.1, 0.3, 0.5mg/kg respectively. The results were as follows:Experiment I. Growth trial results showed that neither se source nor dietary se level had any effect (F>0.05) on daily gain and the ratio of feed to gain, compared with the no-se-fortifled basal diet which contained 0.061mg/kg se. Drip loss of meat was decreased compared with basal diet(P<0.01). But sodium selenite groups weren't different with se-enriched yeast (P>0.05). About serum GSH-PX, 0.3mg/kg Na2SeO3 groups were higher significantly than 0.1 mg/kg se-enriched yeast group, control group was lower significantly than 0.5mg/kg se-enriched yeast and 0.3mg/kg Na2SeO3 group. There were not apparent different among other groups. Whole blood GSH-PX activity increased when dietary se level increased. At the same se level, two groups had no difference (P>0.05). The control group was lower significantly than 0.3, 0.5mg/kg Na2SeO3 and se-enriched yeast groups. Serum LPO has no difference at 0.1 and 0.5mg/kg level, se-enriched yeast groups were lowersignificantly than Na2SeO3 groups at 0.3mg/kg. Tissue se contents were influenced by both se source and dietary se level. Tissue se contents in adding se groups were higher extremely significantly than control group (P<0.01). Liver se contents weren't significant between two source at 0.1, 0.3mg/kg se level. At 0.5mg/kg se, se-enriched yeast groups were higher significantly than Na2SeO3 groups. Kidney se contents of se-enriched yeast groups were higher significantly than those of Na2SeO3 groups at 0.3 , 0.5mg/kg se. Pancreas se contents had no difTerence between O.lmg/kg sodium selenite and O.lmg/kg se-enriched yeast. There were no difference among 0.3 , 0.5mg/kg sodium selenite and 0.3s 0.5mg/kg se-enriched yeast (P>0.05). Muscle se contents were almost same with the pancreas se contents. Feather se contents of O.lmg/kg sodium selenite were different significantly than those of 0.5mg/kg sodium selenite and 0.3mg/kg se-enriched yeast (/><0.05). There were no differences among other adding se groups.Experiment 2. Digestive trial results showed that apparent retentions were different significantly between two sources at O.lmg/kg and 0.3mg/kg se level (P 0.05). There was no difference at 0.5mg/kg se level. When the sodium selenite source was fed, the apparent retention of O.lmg/kg se level was different extremely with 0.3mg/kg and 0.5mg/kg se level ; there was no significant difTerence between 0.3mg/kg and 0.5mg/kg se level. When the se-enrich yeast was fed, the difference of the apparent retention among the three se level groups was significant (/)<0.05), and the apparent retention of O.lmg/kg se level was higher extremely significantly than that of 0.3mg/kg se level (/J<0.01). Neither se source nor se level had any effect on AME and protein metabolism rate. (/)>0.05).The results suggested when the basal diet wasn't deficient se, O.lmg/kg sodium selenite or se-enriched yeast adding to broiler ration had satisfied withbroiler growth and got good performance. Tissue se contents increased with se level increasing in broiler ration. Tissue se contents and apparent retention were higher when organic se adding to diet. The influence of two se sources on broiler performance, drip loss, LPO, blood GSH-PX activity weren't significant.