Reference for Bekhorot 114:34

<big><strong>גמ׳</strong></big> מאי שנא תלת

<big><b>GEMARA: </b></big>What reason is there for these three periods? - Said Rabbah B'Shila: Corresponding [to the three periods when animals give birth]; [some give birth] early [in the season],<span class="x" onmousemove="('comment',' Before Passover.');">²⁴</span>

Jastrow

Jastrow