Altered Genes, Twisted Truth: How the Venture to Genetically Engineer Our Food Has Subverted Science

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59. Actually they do exist...

Writing in the Journal of Animal Science, in the most comprehensive study of GMOs and food ever conducted, University of California-Davis Department of Animal Science geneticist Alison Van Eenennaam and research assistant Amy E. Young reviewed 29 years of livestock productivity and health data from both before and after the introduction of genetically engineered animal feed.

The field data represented more than 100 billion animals covering a period before 1996 when animal feed was 100% non-GMO, and after its introduction when it jumped to 90% and more. The documentation included the records of animals examined pre and post mortem, as ill cattle cannot be approved for meat.

What did they find? That GM feed is safe and nutritionally equivalent to non-GMO feed. There was no indication of any unusual trends in the health of animals since 1996 when GMO crops were first harvested. Considering the size of the dataset, it can reasonably be said that the debate over the impact of GE feed on animal health is closed: there is zero extraordinary impact.

http://www.forbes.com/sites/jonentine/2014/09/17/the-debate-about-gmo-safety-is-over-thanks-to-a-new-trillion-meal-study/#5d39adcdca93

Here is a comprehensive list of animal feeding studies. Many of these studies are independent. The list included systematic reviews, all of which conclude that GMO feed is safe.