Reference for Bekhorot 10:35

<big><strong>מתני׳</strong></big> פרה שילדה מין חמור וחמור שילדה כמין סוס פטורה מן הבכורה שנאמר

But does not the Tanna [of our Mishnah] derive the ruling [for the exemption] of a cow [which gave birth to a species of ass] from 'peter' [firstling[ 'peter' [firstling].<span class="x" onmousemove="('comment',' Why therefore does R. Judah bring his own Scriptural proof since what applies to a cow whose offspring changes species applies equally to a sheep whose offspring changes?');">²⁰</span>

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