Reference for Bekhorot 40:36

לילדו כולהו תרתי ותיהדר איהי ותוליד בהדיהן

And what need is ther for [the Baraitha] to state [that each gave birth to] three at all? Let it say that each [offspring] gave birth and the mother again gave birth together with them?<span class="x" onmousemove="('comment',' So that there will be three mothers with their six offspring and the additional offspring of the she-kid.');">²¹</span>

Jastrow

Jastrow