Mahabharata 4.3.10

4.3.10

vṛṣabhānapi jānāmi rājanpūjitalakṣaṇān |
yeṣāṃ mūtramupāghrāya api vandhyā prasūyate || 10 ||

Sahadeva replied, "I will become a keeper of the kine of Virata's king. I am skilled in milking kine and taking their history as well as in taming their fierceness. Passing under the name of Tantripal, I shall perform my duties deftly. Let thy heart's fever be dispelled. Formerly I was frequently employed to look after thy kine, and, O Lord of earth, I have a particular knowledge of that work. And, O monarch, I am well-acquainted with the nature of kine, as also with their auspicious marks and other matters relating to them. I can also discriminate bulls with auspicious marks, the scent of whose urine may make even the barren being forth child. Even thus will I live, and I always take delight in work of this kind. Indeed, no one will then be able to recognise me, and I will moreover gratify the monarch,"