효모추출물의 사료 첨가가 성장과 사이토카인의 발현 변화에 미치는 영향

The experiment was conducted to compare the effects of supplements of yeast extract on growth and immune responses of chicks fed diets. Total 120 of chicks were employed in this experiment to study the effects of feeding of yeast extract on the performance and expression of cytokine. They were randomly allocated to tree dietary treatments; control, antibiotic group(ABG), yeast extract group(YEG). Growth characteristics by feeding yeast extract were significantly difference on body weight. Feed intake contained yeast extract was 69g daily and showed higher than other group. To evaluate the immune response effects of the feeding yeast extract, the expression patterns of IL-2, IL-6, IFN-γ in spleen cell were studied by RT-PCR. The higher expression levels of IL-2, IL-6 and IFN-γ transcripts after Salmonella gallinarum infection were observed in the group with yeast extract. From the result of this experiment, it could be concluded that feeding yeast extract improves the laying performance growth and immune response activation.