Reference for Chullin 157:41

אין מרביעין עליה לא מין סוס ולא מין חמור לפי שאין יודעין במינה

This shows that he is of the opinion that we do not take into consideration the seed of the male parent;<span class="x" onmousemove="('comment',' For if we did take into account the seed of the male he would not have been so meticulous about the mules that were to be harnessed since each is part horse and part ass.');">¹⁶</span>

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