ה
עֻבָּר שֶׁהוֹצִיא אֵבֶר וְנֶאֱסַר הָאֵבֶר, וְאַחַר כָּךְ נִשְׁחֲטָה הָאֵם, וְהוֹצִיאוּ הָעֻבָּר וַהֲרֵי הִיא נְקֵבָה, הֶחָלָב שֶׁלָּהּ אָסוּר לִשְׁתּוֹתוֹ, הוֹאִיל וְהוּא בָּא מִכְּלַל הָאֵבָרִים, וְיֵשׁ בָּהּ אֵבֶר א’ אָסוּר, וַהֲרֵי זֶה כַּחֲלֵב טְרֵפָה שֶׁנִּתְעָרֵב בַּחֲלֵב כְּשֵׁרָה
Seif 5
Whenever an animal thrust its limb and then returned it and that limb becomes forbidden, and afterwards its mother was slaughtered, If it is female, we are forbidden to drink its milk because the milk comes from all of the animal’s limbs and it has a limb which is forbidden.
Hence, it is comparable to milk from a trefe animal that becomes mixed with milk from a kosher animal.