Reference for Chullin 229:13

וכלאי בהמה גופייהו מנא לן

But perhaps [the inference is this]: whereas diverse kinds in a vineyard are forbidden to be eaten and also to be made use of, diverse kinds of seeds are forbidden to be eaten but are permitted to be made use of? - These [latter] have been compared with diverse kinds of cattle, for it is written: Thou shalt not let thy cattle gender with a diverse kind; thou shalt not sow thy fiel with two kinds of seed,<span class="x" onmousemove="('comment',' Lev. XIX, 19.');">⁹</span>

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