Reference for Bava Kamma 130:18
איל בן יומו קרוי איל דכתיב (בראשית לא, לח) ואילי צאנך לא אכלתי אילים הוא דלא אכל כבשים אכל אלא לאו ש"מ איל בן יומו קרוי איל
R. Zera demurred saying: Why should he not indeed acquire title to it through the change in name?<span class="x" onmousemove="('comment',' [Though 'growth' confers no title.] ');"><sup>27</sup></span> Raba, however, said to him: An ox one day old is already called 'ox', and a ram one day old is already called 'ram'. 'An ox one day old is called "ox",' as written: When an ox or a sheep or a goat is born.<span class="x" onmousemove="('comment',' Lev. XXII, 27. ');"><sup>28</sup></span>
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