Reference for Bava Metzia 67:4

איכא דאמרי אמר רבא נעשה כאומר לו לכשתגנב ותרצה ותשלמני סמוך לגניבתה קנויה לך מאי בינייהו

Why has it been taught: Excepting its shearings and offsprings? — But. said R. Zera, it is as though he had said to him, 'Except its shearings and offsprings.' And why make this an absolute assumption? It may be taken for granted that one gives over those improvements which come from elsewhere, but not those which come from the stock itself.

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