One of the "theories" I've heard out there got my interest recently. Most of these mutilations occur in areas where atomic testing took place and also where the most "chem trail" activity has been reported. The organs routinely harvested would be a good standard for testing of accumulation or after affects over time of radiation, genetic problems, etc.
If it's our own government, it would seem to me purchasing a few cows would be simpler. But ya know how that goes...lol