Reference for Bekhorot 33:15
הן וולדות פטור וולדי ולדות חייב:
it intimates that the law of the firstling does not apply until the sire is an ox and its firstling is an ox?
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הן וולדות פטור וולדי ולדות חייב:
it intimates that the law of the firstling does not apply until the sire is an ox and its firstling is an ox?