Hare Krishna!
Many arguments are made in this respect, that as long as we don't cut the animal we do not incur sin.
In the Mahabharata, there is a verse which states that one who sells the animal, one who buys the animal, one cuts the animal,one who cooks the animal, one who serves the animal and one who eats the animal, all are bound equally by the chain of Karma.
But leaving the spiritual aspect of it, anatomically, the human body is not structured to eat animal flesh. Studies have shown the length of the intestine of a tiger is 4 times the length of it's torso so when it eats flesh the toxins in the flesh are not kept for long in the intestine and are expelled at the earliest. Also the concentration of acid secreted in the stomach is so strong that it burns the bacteria in the flesh. While in the cow, the length of the intestine is 12 times it's torso and so the food takes longer time to be expelled from the body. We have seen that the incidence of the Mad Cow disease (bovine spongi
