DEUT1438 While there is no explicit Torah law forbidding the causing of unnecessary pain to animals, the large variety of regulations ordaining the fair treatment of animals led the majority view in the Talmud to conclude that the prohibition of tza'ar be'alei chayyim (prevention of cruelty to animals) [The term literally means "the suffering of living creatures."] is a Torah prohibition (Bava Metzia 32b, and Shabbat 128b). [The Rabbis understood the law to help unload a burdened animal (Exodus 23:5) as mandating a general concern for the suffering of animals. Meiri, in his commentary on Bava Metzia 32b, argues that a general prohibition against causing unnecessary suffering to animals can be deduced from the previously cited law prohibiting the muzzling of an ox while it is working in the field (this verse; see paragraph 4). Maimonides and Judah the Chasid site yet another basis; see footnote on page 307.] Thus, even when situations arise that are not covered by specific biblical legislation, the operative assumption is that causing unnecessary suffering to animals is prohibited. The word "unnecessary" underscores that not all behavior that causes animals to suffer is forbidden. For example, the Bible permits the slaughtering of animals for human consumption, although Jewish law regulates the slaughter in an effort to try to minimize--though it is, of course, impossible to eliminate--the suffering. Similarly, animal suffering is permitted if there is substantial human benefit to be attained (for example, if insights gained through medical experimentation on animals can lead to a cure for disease; see pages 336 – 338).
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