ABSTRACT Low pregnancy rates and higher than expected abortion rates can result in significant losses to cow-calf producers. Investigation of these complaints is challenging because the underlying cause has often occurred some time before the problem is recognized and there is typically very little diagnostic information available. Many times, cows that are not pregnant and suspect bulls are sold before the full extent of the problem is realized or laboratory sam- ples collected. In other cases, poor herd records may limit the success of the investigation. Despite these frustrations, outbreak investigations can be an excellent opportunity to build a practice and herd investigations can be a change from the routine of every day practice.