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Many religions and ethical systems view the killing of animals as a sin or morally wrong. For example, in Buddhism, killing any life form is considered an evil action that leads to negative karma. Similarly, in Hinduism, killing animals, especially cows, is considered a sin. As Wendy Doniger writes in her "The Hindu: An Alternative History" (2009), respect for animal life is one of the central elements of this religion.
However, in other religious traditions, killing animals is not directly prohibited. In Christianity, for example, St. Thomas Aquinas argues in his "Summa Theologiae" (1274) that God has given man dominion over animals and it is permitted to use them according to human needs, including for food.