The GENERA database lists over 36 examples of multi-year studies. In general, those results do not suggest any health hazards from feeding GMOs to livestock.

Genetically modified crops were introduced for animal feed about 18 years ago. Over a trillion genetically modified meals have been fed to animals. If this type of feed was producing unusual problems among livestock, then farmers would have noticed a long time ago. The system would not be productive because there would be mostly dead or sick livestock if the claims were true.

The most comprehensive study of GMOs and food that was ever conducted was done by researchers from the University of California-Davis Department of Animal Science. The data represented over 100 billion animals. They found that genetically modified feed is safe and nutritionally equivalent of non-GMO feed.