Commentary for Bekhorot 41:10

ואב"א

whereas R'Simeon<span class="x" onmousemove="('comment',' Who uses the phrase 'In the first year', certainly does not agree with Ze'iri, but maintains that discharging can last less than thirty days, so that they gave birth in the first year. (R. Gershom) . According to Rashi the explanation is that the females discharged on the last day of the sixth month and not on the first day of the seventh month. Add to this the thirty days of Ze'iri and the five full months of pregnancy, then the animal enters the shed for tithing at the end of the first year. But R. Simeon who uses the expression 'In the year' does not accept Ze'iri's teaching and therefore the tithing can take place some days earlier, before the completion of the year. A further explanation of Rashi is: According to the first Tanna of the Baraitha above, even if it begins to discharge on the first day of the seventh month, and allowing the thirty full days of Ze'iri, it still gives birth on the first day of the second year. If the year is a leap-year the mothers and their daughters enter the shed to be tithed even in that case. Reckoning the year therefore from Elul to the following Elul, we could place the birth even on the first of Ab. But R. Simeon who uses the expression 'In his first year' does not accept Ze'iri's reaching and they can therefore be tithed together, having been born on the last day of Ab.');">⁸</span>

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