Effect of Multiple Probiotics on Performance and Fecal Ammonia Nitrogen in White Semi Broiler

This study was conducted to evaluate the multiple probiotics prepared based on lactic acid bacteria, <i>Bacillus subtilis</i>, and photosynthetic bacteria for the efficient production of Baeksemi (white semi broiler) for Samgyetang. The experimental groups were LacBacil group (1.0 × 10⁷ CFU/g <i>Bacillus subtills</i> and 1.0 × 10⁷ CFU/g <i>Lactobacillus acidophilus</i>), LacBalcilPho group (1.0 × 10⁷ CFU/mL <i>Bacillus subtills</i>, 1.0 × 10⁷ CFU/mL <i>Lactobacillus acidophilus</i> and 1.0 × 10⁷ Cell/mL <i>Rhodopseudomonas</i> sp.), and a control group (non-addition). The LacBalcilPho group had the highest body weight and total weight gain at the end of experiment, followed by the LacBal group which was higher than the control group, significantly (<i>P</i>&lt;0.05). Feed intake and feed conversion rate of the multiple probiotic groups showed no significant difference compared to the control group. NH₄-N concentration was lower in all groups of multiple probiotics than in control group after 3 weeks of testing (<i>P</i>&lt;0.05). At the end of the test, the levels of NH₄-N were lower in the following order: LacBalcil group, LacBalcilPho group, and control group (<i>P</i>&lt;0.05). <i>Salmonella</i> sp. population of manure showed the lowest level in LacBalcilPho group at 3 weeks of testing (<i>P</i>&lt;0.05). At the end of the test, <i>Salmonella</i> sp. showed a lower population in the following order: LacBalcilPho group, LacBalcil group, and control group (<i>P</i>&lt;0.05). Therefore, based on the above results, it is expected that multiple probiotics using lactic acid bacteria, <i>Bacillus subtilis</i>, and photosynthetic bacteria will function as a probiotic for improving growth and intestinal environment in Baeksemi.