Reference for Chullin 147:25

לחין מטמאים יבשים אין מטמאים

But has it not been taught: The slaughtering of a live eight months' birth could prove [otherwise], for even though slaughtering applies to its kind, the slaughtering does not render it clean? - R'Kahana answered, [It means that] through its dam slaughtering applies to its kind.<span class="x" onmousemove="('comment',' For by the slaughtering of the dam the foetus within the womb is rendered permitted to be eaten as if it were itself slaughtered, so that one could say that slaughtering applies to its kind.');">¹¹</span>

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