Reference for Avodah Zarah 93:1

אבל עיברו ולבסוף נרבעו ד"ה אסורין וה"נ כעיברו ולבסוף נרבעו דמי

but when they had conceived and then been subject to bestiality, all agree that [the young] are forbidden [as offerings]? Similarly here [with the standing-grain] it is analogous to the circumstance where the animals conceived and had then been subject to bestiality.

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