Reference for Bekhorot 39:25

טינוף פוטר

Did not Raba say above that it is obvious that R'Ishmael holds with R'Meir, who takes into consideration [the minority]? - R'Ishmael takes into consideration [the minority] when the object is to make the ruling more stringent.<span class="x" onmousemove="('comment',' And he rules that the offspring, even after the first year, is a questionable firstling, for a minority of animals do not give birth in the first year, whereas if we went only by the majority, an animal born after the first year would be regarded as hullin, without any doubt as to whether it is a first-birth.');">⁴</span>

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