Reference for Yoma 127:5

במאי קא מיפלגי רב סבר בעלי חיים אינן נידחין ורבי יוחנן סבר בעלי חיים נידחין

- R'Johanan said: The second of the first pair should be left to pasture, the second pair should be offered up. In what principle do they differ? - Rab holds: Living animals<span class="x" onmousemove="('comment',' If they are temporarily invalidated, they can still be used by means of the substitution of another animal as pair.');">⁸</span>

Jastrow