For the source text click/tap here: Chullin 37
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Generally speaking, only healthy animals can be slaughtered for kosher food. Thus, a tereifa – an animal that has a terminal condition – cannot be used. Nevertheless, if an animal is merely a mesukenet – it is ill – and its owner wants to slaughter it so that he can benefit from its meat, the Mishna teaches that such sheḥita would be kosher, assuming that the animal shows a sign of vitality when killed.
According to Rabban Shimon ben Gamliel this would require movement of the animal’s limbs; according to Rabbi Eliezer, it is enough if blood spurted out at the time of sheḥita.
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