Reference for Chullin 158:35

אילימא בתייש הבא על הצבייה וילדה

If you suggest that a he-goat covered a hind and it gave birth [to the koy], then the view of R'Eliezer that it is not subject [to these dues] is clear, for he is of the opinion that we do not say that the term 'sheep' includes tha which is a sheep in part only.<span class="x" onmousemove="('comment',' Moreover, according to R. Eliezer, this koy is entirely a deer for he holds that we ignore the seed of the male parent.');">¹⁸</span>

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