Everyone has got the right. But because we are desiring to enjoy more, therefore we do not give the chance to the animals to live properly; rather, we are trying to eat the animals. This is not required. This is called nirasih. Why you should eat animals? That is uncivilized life. When there is no food, when they are aborigines, they may eat animals, because they do not know how to grow food. But when the human society becomes civilized, he can grow so many nice foods, he can keep the cows, instead of eating the cows. He can get milk, sufficient milk. We can make so many preparation from milk and grains. So we should not desire unnecessarily to enjoy more.
Lecture on Bhagavad-gita 4.21, Bombay, 10 April, 1974