This study was conducted to examine the effect of a diet supplemented with dried Bacillus subtilis culture on broilers' productivity and blood characteristics. Broiler feeding experiments were conducted twice. The diet fed to the control group was supplemented with 0.2% Palm MateⓇ commercially available probiotics (B. subtilis), and the diet fed to the experimental group was supplemented with ThekerⓇ 0.05% dried B. subtilis culture (DBC) in experiment 1, and 0.1% DBC in experiment 2. Treatment was administered for four weeks in both groups. A higher average daily gain was observed in the group treated with 0.05% DBC in experiment 1 compared with the control group, which was significantly higher in the group that received 0.1% DBC in experiment 2 compared with the control group. A higher production index was observed in the groups that received treatment than in the control group and was higher in the 0.1% DBC group than in the 0.05% DBC group. Significantly lower serum triglyceride (TG) was observed with increased DBC content. Although the findings showed no statistical significance, lower total cholesterol (T-C) was observed in the treated group than in the control group. HDL-cholesterol (HDL-C) content showed a significant increase in the DBC-treated groups. A significantly opposite outcome was observed for LDL-cholesterol (LDL-C) content. These findings demonstrated that the atherogenic index (AI) and cardiac risk factor (CRF) decreased in the DBC-treated groups. Significantly lower serum levels of glutamic-oxaloacetic transaminase (GOT: aspartate aminotransferase, AST) and glutamate pyruvic transaminase (GPT: alanine transaminase, ALT) were detected with an increase in DBC content in the treated groups compared with the control groups. To summarize the findings described above, adding ThekerⓇ dried B. subtilis culture to broiler feeds positively improved productivity through weight gain of broilers and the production of healthier functional broilers through the improvement of blood lipids and liver function. It is expected that the findings of this study will be helpful in the effort to increase the profitability of broiler chicken farming and promote human health.

Abstract
Introduction
Materials and Methods
    1. Experimental design
    2. Laboratory animals
    3. Duration and setting
    4. Experimental feed
    5. Feeding management
    6. Measurement of growth performance
    7. Assessment of serum lipid profile
    8. Statistical analysis
Results and Discussion
    1. Feed intake and growth performance
    2. Serum lipid profiles
    3. Activities of glutamic oxaloacetic transaminaseand glutamic pyruvic transaminase in serum
Acknowledgement
References

• Si Hyung Park(Department of Animal Resources, Daegu University)
• Se In Seo(Department of Animal Resources, Daegu University)
• Sang Tae Baeck(SOLTECH, Daegu, 41025, Korea)
• Byoung Boo Seo(Department of Animal Resources, Daegu University) Corresponding author