Reference for Bekhorot 39:40

ואיכא בינייהו דזעירי דאמר זעירי

What he had on traditions<span class="x" onmousemove="('comment',' Which does not say: That of a goat in its first year. thus implying that even if it gives birth on the first day of the second year. the offspring is a firstling, as we accept Ze'iri's dictum that its discharge is for thirty full days, after which there is a period of pregnancy of five complete months, so that it would give birth on the first day of the second year.');">¹⁰</span>

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