Antibacterial peptides (ABPs) are important resources from which it may be able to develop novel therapeutic agents against the ever growing number of antibiotics resistant microorganisms. The small intestine of pig may possess one or more antimicrobial peptides that could be developed as excellent therapeutic agents. After the fresh small intestines of pig were treated by grinding, ultrasonic treatment, heating and 5% acetic acid extraction, antibacterial peptides was isolated from small intesti...