Responsa for Bekhorot 47:8
רשב"ג אומר
What is the Baraitha [referred to above]? - As it has been taught: If one buys an animal giving suck from a gentile, the young which follows it, is a doubtful firstling,<span class="x" onmousemove="('comment',' For it is possible that the animal had never before given birth, and the fact that it gives milk is not a conclusive proof, as there is a minority which gives milk without having yet given birth. It is thus a doubtful firstling.');"><sup>4</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.
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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