Reference for Chullin 158:8

היכי דמי

If you suggest that a he-goat covered a hind and [the hind] gave birth to a young, and then one slaughtered the dam and its young; but [this cannot be, for] R'Hisda has also stated that all agree that if the dam was a hind and its young [the offspring of] a he-goat, one is not culpable [for slaughtering the dam and its young on the same day], for the Divine Law says: a sheep.

Jastrow

Jastrow

Jastrow

Jastrow