This paper elucidates various kinds of risk for livestock farms. In particular, this paper elucidates various kinds of risk at the heart of pig farms from the point of view of case studies in Gunma Prefecture and Miyazaki Prefecture, Japan. Some concrete examples include the outbreak of livestock infectivity risk, risk of rising formula feed prices and risk of price drop of livestock products. Secondly, this paper analyzes the risk disposal plane and behavior when pig farms choose among systems, funds and mutual aid projects. When the livestock infectivity risk rose in a large-scale pig corporation, the amount of damage exceeded the standard scale of family pig farms. When formula feed prices rose from 2006 to 2008, a large-scale pig corporation suffered financial loss. After foot-and-mouth disease occurred in Miyazaki Prefecture in 2010, the restart of pig farms suffered instability because of their technical level and various factors.