Reference for Chullin 157:35

פרדה שתבעה אין מרביעין עליה לא סוס ולא חמור אלא מינה

And R'Papa has If its ears are long and its tail short, it is the offspring of a she-ass; if its ears are short and its tail lo offspring of a mare! - We must suppose here that it was dumb and mutilated.<span class="x" onmousemove="('comment',' I.e., it could not utter any sound and its tail and ears were cut off. It is therefore impossible to examine the mule by the abovementioned criteria.');">¹⁴</span>

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