Study Bekhorot folio 19B with parallel Hebrew-English text, traditional commentary, and modern study tools. Free access to Babylonian Talmud online.
If it serves to exclude a case where a female emerged from the womb before it, that is derived from the phrase “that which opens any womb.” Rather, conclude from it that “firstborn” serves to exclude a case where an animal emerged from the womb after its older sibling was born by caesarean section.
Rav Aḥa of Difti said to Ravina: If it enters your mind that a firstborn in one aspect is called a firstborn and the derivation is based on the fact that the term “firstborn” is superfluous, that works out well in a case where a male emerged by caesarean section and then another male emerged through
But in a case where a female emerged by caesarean section and afterward a male was born through the womb, let it be sanctified, as it is the firstborn of the males and the firstborn of the womb. One cannot derive the exclusions of both of these cases from the word “firstborn,” and yet the baraita i
Mishnah: In the case of one who purchases a female animal from a non-Jew and does not know whether it had previously given birth or whether it had not previously given birth, and after the purchase the animal gave birth to a male, R' Yishmael says: If the mother was a goat within its first year t