Reference for Chullin 280:5

הכי קאמר אפרוח שאמן טרפה חייב בשילוח

Should we say that, since if he were to leave off cutting at this point they would become trefah,<span class="x" onmousemove="('comment',' For in the case of birds the slaughtering is valid only when the greater portion of one organ of the throat has been cut, and to leave off before this requisite amount has been cut through would render the bird trefah. It must, however, be assumed here that the partly-cut organ was the gullet, for a partly-cut windpipe does not render trefah (v. supra 29a) ; v. Shak, Yoreh De'ah c. 292, sec. 15; and Glosses of R. Bezalel Regensburg a.l.');">³</span>

Rashi on Deuteronomy

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