Reference for Bekhorot 43:28

אמר רב יהודה אמר שמואל משום ר' אליעזר ברבי צדוק כך היו מפרשין בירושלים

In the case of an animal, the size of the coil is like the woof.<span class="x" onmousemove="('comment',' If the embryo had not yet formed a round head of the size of the coil of the woof, then, if the embryo died inside the animal, and the shepherd stretched his hand inside, he does not receive levitical uncleanness.');">¹³</span>

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