English: "As the gazelle and as the deer" — Beis Hillel say: One may assign shares in a firstborn even to a non-Jew. What is the reason? Because the verse says "as the gazelle and as the deer"—just as a gazelle and a deer are permitted to non-Jews, so a blemished firstborn is permitted to non-Jews.
On the daf / in context: A blemished firstborn is treated like ordinary chullin meat and may therefore be given to a non-Jew.
Type of Learning
Derash on the verse (Bekhoros) — a blemished firstborn may be given to a non-Jew.
What Is Learned
A blemished firstborn may be shared with or given to a non-Jew, just as ordinary gazelle or deer meat may be.