Reference for Chullin 233:6

וכי מה למדנו משור זבח השלמים

AND THE PROHIBITION OF THE BLOOD IS MORE STRICT, FOR IT APPLIES TO CATTLE, WILD ANIMALS AND BIRDS, WHETHER CLEAN OR UNCLEAN; BUT THE PROHIBITION OF THE FAT APPLIES TO CLEAN CATTLE ONLY.<span class="x" onmousemove="('comment',' I.e., to those animals which are fit for sacrifices, for it is written (Lev. VII, 25) . Whosoever eateth the fat of the beast, of which men offer an offering mode by fire unto the Lord, etc.');">⁴</span>

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