South Africa yellow corn prices have increased 39 percent in the last six months and national stocks have dropped 40 percent, causing livestock feed producers to seek out cheaper alternatives like wheat for the first time in a decade, according to reports.

Historically, wheat used to be approximately 900 rand (US$112) more expensive per ton than yellow corn, but the difference has narrowed, said Brink van Wyk, a trader at Bosveld Graan.