In October 2000, Jerry Rosman, an Iowa farmer, noticed a problem with his hogs. During breeding, the female sows exhibited all signs of pregnancy, yet when the time came to deliver nothing happened, a phenomenon called “pseudopregnancy.” Over the next year, the breeding rates in Rosman’s sow herd plummeted 80 percent. Rosman eventually traced the problem back to his feed, which was genetically modified Bt corn. Laboratory tests revealed that the corn contained high levels of Fusarium, a fungal pathogen that can produce mycotoxins, which can enter the food chain and negatively affect human and animal health. Rosman wasn’t the
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