Reference for Chullin 106:29

אמר רב אשי לא אמרינן

Ilfa raised the question: How much of the organs of the throat must be torn loose [in order to render the animal trefah]? - R'Zera said: The question raised by Ilfa was answered long ago by Rabbah B'Bar Hana, for Rabbah B'Bar Hana said in the name of Samuel, If the greater part [of the circumference] of the organs of the throat was torn loose [from its connection on top], the animal is trefah.

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