daf bit: Bechorot 17
The torah tells us that the first-born male of livestock belongs to the
kohanim. A mishna on today's daf says: if a ewe who has never before
given birth has two male offspring (twins) and their heads both come
out at the same time, what do we do? R. Yose of Galilee says both
belong to the kohein, but the sages say one belongs to the kohein and
the other to the owner. R. Tarfon says the kohein chooses the better one;
R. Akiva says we compromise between them, and the Israelite leaves the
second one to pasture until it acquires a blemish (which makes it
unsuitable as an offering for the kohein, so then the Israelite can
eat it). (17a)
