Reference for Chullin 205:25
רבא אמר
On what principle do they differ? - The animal in this case was rendered trefah as soon as the greater part of it had come forth [out of the womb].
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Talmud Bavli
רבא אמר
On what principle do they differ? - The animal in this case was rendered trefah as soon as the greater part of it had come forth [out of the womb].