The Feedlot Atlas app is intended to help veterinary students, technicians, clinicians, specialists, and cattle producers. It contains a thorough and comprehensive collection of feedlot cattle diseases that ranges from rare conditions of unknown etiology to very well understood and common diseases, with 10 chapters arranged by body system available in Chinese, English, French, Portuguese, Russian, Spanish and Turkish.There are over 700 educational, highly informative high resolution images in the atlas. Although most of the images are of postmortem lesions, pictures of clinical findings in live animals are also included where applicable. Postmortem examination has been and continues to be the main diagnostic procedure used for feedlot cattle diseases.The aim of this atlas is to provide the user with reference photographs of different lesions and diseases encountered in cattle practice.