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evam prthv-adayah prthvim
annadah svannam atmanah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
My dear Vidura, chief of the Kurus, in this way King Prthu and all the others who subsist on food created different types of calves and milked out their respective eatables. Thus they received their various foodstuffs, which were symbolized as milk.