Shiva Purana
वृषघ्नस्तु मनोः पुत्रो गोपालो गुरुणा कृतः ॥ पालयामास गा यत्तो रात्र्यां वीरासनव्रतः ॥ ५३ ॥
Pṛṣadhra, a son of Manu was made the keeper of cows by his preceptor. During the nights, observing the posture of heroes, he diligently looked after the cows.
english translation
vRSaghnastu manoH putro gopAlo guruNA kRtaH ॥ pAlayAmAsa gA yatto rAtryAM vIrAsanavrataH ॥ 53 ॥
hk transliteration by Sanscript