Commentary for Chullin 108:4

אלו טרפות הני הוא דטרפה הא דרב מתנא כשרה

He saw, however, that R'Mattena's case might not be admitted [as a trefah] under the clause 'This is the rule', for it not quite the same as when an organ is pierced or severed or gone entirely, he therefore taught: THE FOLLOWING [DEFECTS] DO NOT RENDER CATTLE TREFAH, emphasizing that only the following do not render an animal trefah, but the defect stated by R'Mattena does.

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