outdoorfan,
I am not aware of any studies documenting the change in nutrient content of deer that have been fed corn, GMO or otherwise, as opposed to their native diet. However, there is a vast amount of scientific literature on the nutrient content of grass fed beef and bison as opposed to those that have been fed corn. Grass fed beef and bison have the same healthy ratio of omega 3 and omega 6 EFA's as wild caught salmon. Further, grass fed beef and bison have high levels of CLA while salmon does not. There is also a lot of data that confirms the health benefits/nutrient content of pastured pork and poultry as opposed to that which has been produced conventionally. Ranchers that produce grass fed/pastured animals tend not to use growth hormone or antibiotics and most are happy to provide certification of same. The nutrient profile of grass fed IS superior. Similarly, the health benefits of eating grass fed/pastured is considerable.
I strongly suspect that venison from an animal that has existed on it's native diet as opposed to that which has eaten a considerable amount of corn, is superior from a nutritional standpoint.
Regards,
Tony