Reference for Chullin 115:30

לא יקרב לגבי מזבח ר' יהושע אומר יקרב במאי קא מיפלגי כשעיברה ולבסוף נטרפה רבי אליעזר סבר

It must be, surely, that the animal was first impregnated and then became trefah.<span class="x" onmousemove="('comment',' It cannot be otherwise, for according to the view now held an animal which is trefah can no more become pregnant.');">¹³</span>

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