Verse 13.3.6.5

ṣoḍaśāśvastomīyā juhoti ṣoḍaśakalā vai paśavaḥ sā paśūnām mātrā paśūnena mātrayā samardhayati yatkanīyasīrvā bhūyasīrvā juhuyātpaśūnmātrayā vyardhayetṣoḍaśa juhoti ṣoḍaśakalā vai paśavaḥ sā paśūnām mātrā paśūneva mātrayā samardhayati nānyāmuttamāmāhutiṃ juhoti yadanyāmuttamāmāhutiṃ juhuyātpratiṣṭhāyai cyaveta dvipadā uttamā juhoti pratiṣṭhā vai dvipadāḥ pratyeva tiṣṭhati jumbakāya svāhetyavabhṛtha uttamāmāhutiṃ juhoti varuṇo vai jumbakaḥ sākṣādeva varuṇamavayajate śuklasya khalaterviklidhasya piṅgākṣasya mūrdhani juhotyetadvai varuṇasya rūpaṃ rūpeṇaiva varuṇamavayajate

Preview of English translation:

5. Sixteen Ashvastomiya oblations he performs, for animals (cattle) consist of sixteen parts: that is the measure of cattle, and he thus supplies cattle with their (right) measure; Were he to offer either less or more, he would deprive cattle of their (right) measure. Sixteen he offers, for cattle consist of sixteen parts: that is the measure of cattle, and he thus supplies cattle with their (right) measure. He offers no other as a final oblation: were he to offer another as a final oblation, he would lose his support. The Dvipadas he offers last, for Dvipadas are a support: he thus finds a support (establishes himself). With, “To Jumbaka hail!” he offers, at the purificatory bath, the last oblation; for Jumbaka is Varuna: by sacrifice he thus manifestly redeems himself from Varuna. He offers it on the head of a white-spotted, baldheaded (man) with protruding teeth and reddish brown eyes; for that is Varuna’s form: by (that) form (of his) he thus redeems himself from Varuna.

For a detailled translation, including proper diacritics and footnotes, go the full English translation.