Reference for Bava Batra 183:5

לא צריכא דאייקר בישרא וקם בדמי רדיא אי הכי למאי נפקא מינה נפקא מינה לטרחא

But [cannot the object of the sale] be seen [from the following]? If [he is] a man that buys for slaughtering [then this sale also must have been] for [the purpose of] slaughtering; [and] if for ploughing, [it must have been] for [the purpose of] ploughing. [why then, should there be a dispute between Rab and Samuel]? — [This dispute relates to the case] of a man who buys for both.<span class="x" onmousemove="('comment',' Lit., 'for this and for that'; for ploughing or for slaughtering. ');">⁹</span> But why not see what price<span class="x" onmousemove="('comment',' The cost of an animal for work is much higher than one for food only. ');">¹⁰</span>

Jastrow