Can you feed snake pieces of beef or pork?

With some snakes you can. I knew someone years ago who had a couple of large burmese pythons he fed pieces of chicken. The general consensus is that it is much healthier to feed snakes whole prey, as they get various nutrients from the organs. But who knows. I don't think anyone has done enough research to know the exact nutritional needs of any species of snake, so it's hard to say. Most people go with the tried and true feeding methods, rather than risk the long term health of their animals experimenting.