"The world’s appetite for meat is growing, and the production of animal feed is an increasing strain on land and water. Insects could provide much of the protein animals need at a much lower environmental cost; many insect species can feed on manure, like Grant’s maggots, or other types of organic waste, such as leftover food, offal, and grains discarded by breweries.
“Regulatory agencies are beginning to weigh the benefits against potential safety risks, including the possibility that insects might accumulate environmental toxins or even transmit diseases to the farm animals that eat them. On 8 October, the European Food Safety Authority (EFSA) in Parma, Italy, released its first report on the risks of using insects as food and animal feed. It concluded that the risks depend on the insect species used—and that more studies like PROteINSECT are needed before livestock or fish are switched to this new diet. But in other countries the brave new world of industrial-scale insect farming is already on view.”
“Why insects could be the ideal animal feed”
http://news.sciencemag.org/europe/2015/10/feature-why-insects-could-be-ideal-animal-feed