I visited with Don Huber who worked for the military in their germ warfare program then was head of research at Purdue University until he retired. It was at a conference on GMO feed and that's what had caused 75 out of 250 of my cows to abort several years ago.
There was an organism killing the fetus that they could see with an electron microscope but they didn't know what it was and the USDA wasn't interested in looking in to it. They did finally identify that organism and he said it was Prions.
It's in the GMO feed and women who drink milk from cows eating GMO feed or eat meat from beef from cattle being fed GMO feed have trouble when they are trying to get pregnant and raise a family. Same thing happens with cattle and caused a huge loss for me.