Reference for Chullin 149:33
חלבו כחלב חיה חדשים גרמי
R'Johanan says: This fat is as the fat of [an animal], because the [fulfilment of the] months [of pregnancy] alone renders it [an animal].
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Talmud Bavli
חלבו כחלב חיה חדשים גרמי
R'Johanan says: This fat is as the fat of [an animal], because the [fulfilment of the] months [of pregnancy] alone renders it [an animal].