Śatapatha Brāhmaṇa ("of a hundred paths") 5.5.2.9

5.5.2.9

atha pṛṣatīṃ vicitracarbhām marudbhya ālabhate | tasyā eṣaivāvṛdviśo vai maruto viśāmevainametadgarbhaṃ karoti tasyāṃ etādṛśyeva pṛṣatī vicitragarbhā dakṣiṇā

They then seize a dappled one, which is clearly with calf, (as a victim) for the Maruts. The mode of procedure regarding this one is the same. The Maruts being the clans, he thereby makes him the embryo of the clans. The sacrificial fee for this (cow-offering) is just such a dappled (cow) that is clearly with calf.