Responsa for Bekhorot 47:28
ה"ק
Come and hear: If one went among his herd and saw [both the animals] now bearing for the first time giving suck and those not now bearing for the first time giving suck, he need not fear that perhaps the offspring of this one came to the other or the offspring of the other came to this one.
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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