Bekhorot 20 – בכורות כ׳ | Daf Yomi with Rashi, Tosafot, the Rambam and halacha

What Bekhorot 20 teaches

Ravina explains the Rabbis disregard majorities that depend on mating, leaving the pregnancy status of a bought goat in doubt.
A murky uterine discharge indicates a prior fetus, exempting subsequent births from bechor if sufficient time elapsed before conception.
Ten ma'aser-eligible kids can emerge in one year only if the mother's triplet daughters each give birth to triplets.

The sugyot

The Gemara resolves why a goat bought after its first year remains in doubt: either Rabbi Yishmael follows Rabbi Meir, or the Rabbis reject action-dependent majorities.
The Gemara examines whether the first birth from an animal bought from a gentile is a definite firstborn, debating if we suspect prior miscarriage.
The Gemara defines when discharge or milk exempts offspring from bekhorah, analyzing pregnancy timeframes and whether halakha fears a minority.
The Gemara examines whether a goat can produce ten ma'aser-eligible descendants in a single year, probing gestation limits and litter sizes.

Halachot from the daf

Following a majority dependent on human or physical action
Firstborn status of animal acquired from a gentile
Exemption from firstborn status by discharge of fetus or placenta
Firstborn status of animal bought from gentile bearing offspring in first year
Whether milk production exempts an animal from firstborn status
Presumption of prior birth when an animal nurses an offspring
Levirate concern when a mother-in-law departed overseas while pregnant
Exemption from firstborn status through expelling a murky discharge (tinuf)
Combining mother and offspring born within one year for animal tithe

Gems from the Daf

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