Related for Bekhorot 65:12
(דברים טו, כב) כצבי וכאיל מה צבי ואיל מותר לעובדי כוכבים אף פסולין מותר לעובדי כוכבים
as the gazelle and the hart are permitted to be eaten by a gentile, so a firstling is permitted to be eaten by a gentile.
Tosefta Beitzah (Lieberman)
One must not flay the legs of a slaughtered animal on the holiday. And one must not flay the legs of a slaughtered animal on the working day, if it is a firstborn or a sacred animal that has become unfit acts. You can do anything for circumcision on a holiday necessary to do; Things that one is not allowed to do on the Sabbath, one may also do on the holiday: He may grate cumin and mix wine with oil. Rabban Shimon ben Gamliel says: Only he shall not first tear canvas to rags.
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