The Mantras contain these references of kine: Kine are gifted with strength and energetic exertion. Kine are also wise. They are the root of that immortality which sacrifice yields. They are the root of all energy. They are the steps by which earthly prosperity is gained. They are the eternal course of the universe. The multiply one's race.
उर्जस्विन्य ऊर्जमेधाश्च यज्ञे गर्भोऽमृतस्य जगतोऽस्य प्रतिष्ठा। क्षिते रोहः प्रवृहुः शश्वदेव प्रजापत्याः सर्वमित्यर्थवादाः॥