This study was conducted to investigate the efficacy of mixed probiotic on the immunity, productivity index and mortality rate in the broiler. Total of 120 one-day-old Ross broilers chicks were randomly assigned into two treatments (control dietary group and probiotic-treated group) with three replications of each treatment. The probiotic group broiler had a lower mortality rate than control during the experimental period. The productivity index in the probiotic group increased significantly than the control group. The weight of the bursa of fabricius was high in the probiotic-treated group than the control group. Activated the immunity level after fed the probiotic mixed diet compared to the control group. Furthermore, the probiotic diet significantly decreased the saturated fatty the control group. Whereas the probiotic mixed diet increased the unsaturated fatty acid than the control group. Afterward, the diet including probiotic induced positive impact on broilers immunity level. This indicates that a probiotic mixed diet could be protecting the intestine from the invasion of a pathogenic organism. It would be beneficial to the poultry industries by decrease the broiler mortality rate with elevated the immunity.

Ⅰ. Introduction
Ⅱ. Materials and Methods
    1. Probiotic Products
    2. Broiler and Experimental Design
    3. Sample Collection
    4. Growth Performance
    5. Mortality
    6. Meat Quality Analysis
    7. Measurement of Fatty Acid
    8. RNA Extraction and qRT-PCR
    9. Statistical Analysis
Ⅲ. Results
    1. Mortality Rate and Productivity Index
    2. Growth Performance
    3. Organs Weight Changed
    4. Meat Quality
    5. Free Fatty Acid Level
    6. Immunity Level of Broiler
Ⅳ. Discussion
References

• Siddiqui Sharif Hasan(전북대학교 축산학과) | 시딕 샤리프 하산
• Hwang Chae Yeon(전북대학교 축산학과) | 황채연
• Choe Ho-Sung(전북대학교 동물생명공학과) | 최호성
• Shim Kwan-Seob(전북대학교 동물생명공학과) | 심관섭 Corresponding author