After a Vaisya has received the sacraments and has taken a wife, he shall be always attentive to the business whereby he may subsist and to (that of) tending cattle.
प्रजापतिर्हि वैश्याय सृष्ट्वा परिददे पशून् । ब्राह्मणाय च राज्ञे च सर्वाः परिददे प्रजाः ॥ ३२७ ॥
For when the Lord of creatures (Pragapati) created cattle, he made them over to the Vaisya; to the Brahmana, and to the king he entrusted all created beings.
न च वैश्यस्य कामः स्यान्न रक्षेयं पशूनिति । वैश्ये चेच्छति नान्येन रक्षितव्याः कथं चन ॥ ३२८ ॥
A Vaisya must never (conceive this) wish, I will not keep cattle; and if a Vaisya is willing (to keep them), they must never be kept by (men of) other (castes).
बीजानामुप्तिविद् च स्यात् क्षेत्रदोषगुणस्य च । मानयोगं च जानीयात् तुलायोगांश्च सर्वशः ॥ ३३० ॥
He must be acquainted with the (manner of) sowing of seeds, and of the good and bad qualities of fields, and he must perfectly know all measures and weights.