The destruction of animals is the sacrifice sanctioned for the Kshatriyas. The growing of corn is the sacrifice sanctioned for the Vaisshyas. Serving the three other orders is the sacrifice sanctioned for the Shudras. Penance is the sacrifice sanctioned for the Brahmanas.
आलम्भयज्ञाः क्षत्राश्च हविर्यज्ञा विशः स्मृताः। परिचारयज्ञाः शूद्रास्तु तपोयज्ञा द्विजातयः॥