PURPOSE: A feed additive having excellent antibacterial function is provided to improve the immunity strength of domestic animals by mixing the additive with conventional feed. CONSTITUTION: A feed additive contains yellow soil containing a nicotiana tabacum stem extract, a solanum melongena stem extract, dryobalanops aromatic, and minerals. The nicotiana tabacum and solanum melongena stem extract are attached to particles of the yellow soil. The feed additive is capable of being formed in a pill form or a powder form.본 발명은 가지(Solanum melongena L.)의 줄기 추출물 및 연초(Nicotiana tabacum Linne)의 줄기 추출물이 흡착된 황토흙을 유효성분으로 함유하는 것을 특징으로 하는 사료 첨가제에 관한 것이다.
