Using the monthly pork carcass production and wholesale prices of pork carcasses by grade in the central wholesale market in Japan, this study analyzed variable cyclical fluctuations from 1989 to 2018. The results revealed that the basic cycle period of pork carcass production fell from 60 months to 46 months until 2010 and then increased. For wholesale prices of pork carcasses by grade, the cycle period of the highest grade shortened from 65 to 40 months, and that of the out-of-grade shortened from 59 to 35 months. The wholesale prices by other grades of that the high, the weighted average of highest and high, the medium, and the average, each cycle period of these four grades increased from approximately 58 months to approximately 82 months.
