... Agents, Endocrine System Agents, Gastrointestinal Agents, Immune Function Agents, Respiratory System Agents, Urinary System Agents, Vitamins ... : 10%;20% Application: Boar,sow Appearance: White micro-sphere Function: Prevent and treat respiratory diseases, septic colibacillosis ... the high quality polymer material possess delay effect function, and the effective blood concentration lasted for longer ...