Commentary for Chullin 157:17
מיפשט פשיטא ליה פרי עם האם שרי
If you say that he [R'Judah] was certain of it, then the offspring is permitted to breed with the [species of the] dam; but if you say that he was in doubt about it, then it is forbidden for the offspring to breed with the [species of the] dam.<span class="x" onmousemove="('comment',' Since from the aspect of the male parent the offspring is an ass, it may not interbreed with a mare.');"><sup>6</sup></span>
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