For the source text click/tap here: Chullin 29
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The rabbis ask each other about when the slaughter is accomplished. Reish Lakish teaches in the name of Levi the Elder that slaughter is complete at its conclusion. Rabban Yochanan teaches that the act of slaughter is accomplished at each stage of the process. Rava comments that all agree that when a Gentile cuts one siman and a Jew cuts the other, the slaughter is not valid at any point. The Gentile makes the animal a treifa, disqualified from slaughter due to ritual impurity.
We explore further the gentile bans on shechita past and present.