USD/JPY fell to a fresh weekly low below 111.00 on August 31, 2018, as renewed US-China trade war fears boosted demand for the yen as a safe haven. The Bank of Japan also lowered the purchase frequency for some JGBs for September, and technical selling below 200-hour SMA support added to the slide.
Currency moves of this kind have little direct effect on feed grain supply or demand. A weaker dollar against the yen can make US grain and meal slightly less competitive in Japan, but the effect on feed prices is marginal.
Not enough comparable past events yet for a historical read.
Moves of each commodity's benchmark from the last close before the event. Historical reads pool past events of the same kind; they describe what happened, not what will. Not investment advice.