Talmud for Bekhorot 2:5
רָחֵל שֶׁיָּלְדָה כְּמִין עֵז, וְעֵז שֶׁיָּלְדָה כְּמִין רָחֵל, פָּטוּר מִן הַבְּכוֹרָה. וְאִם יֵשׁ בּוֹ מִקְצָת סִימָנִין, חַיָּב:
If a sheep gives birth to [a creature which looks] like a goat, or a goat gives birth to [a creature which looks] like a sheep, it is exempt from [the obligations of] the firstborn. If it has some signs of its own species then it is obligated.
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