Talmud Bavli
Talmud Bavli

Responsa for Bekhorot 47:53

כל מקום ששנה רשב"ג במשנתינו הלכה כמותו חוץ מערב וצידן וראיה אחרונה

And, moreover, if it is according to the Rabbis, why 'Until he come and teach righteousness to you'? 'Until it be known to you' is what is required?<span class="x" onmousemove="('comment',' As this is not a question of pronouncing a legal decision but merely of revealing or intimating whether it is its offspring.');"><sup>31</sup></span>

Teshuvot Maharam

Q. A bought from a Gentile a cow that already was yielding milk. Should the cow bear a male calf in A's house, would such calf be unfit for eating purposes for fear lest it be a firstling?
A. The fact that a cow yields milk is no proof that she has already given birth to a calf, for it sometimes happens, though very rarely, that a cow yields milk even though she has not as yet given birth.
SOURCES: Cr. 312; L. 187; Orhot Hayyim p. 21. Cf. Moses, Minz, Responsa 34; ibid. 35; Terumat Hadeshen 271; Isserlein, Pesakim 129; ibid. 167.
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