Reference for Keritot 42:15

מאי כולו היתר

If that relating to breeding diverse kinds or to ploughing with diverse kinds, have we not learnt: Beasts and fowl are subject to similar laws?<span class="x" onmousemove="('comment',' B.K. 54b. Among the laws enumerated as applying equally to cattle, beasts and fowl, is expressly mentioned the law of kil'ayim.');">⁹</span>

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