Reference for Bekhorot 47:28

ה"ק

Come and hear: If one went among his herd and saw [both the animals] now bearing for the first time giving suck and those not now bearing for the first time giving suck, he need not fear that perhaps the offspring of this one came to the other or the offspring of the other came to this one.

Jastrow

Jastrow

Jastrow

Jastrow

Jastrow

Jastrow