Jaiminīya (Talavakāra) Brāhmaṇa 30.175

They thereby make cattle the counterparts of cattle;
they do not make them visible counterparts here.
Therefore cattle give birth to various forms: even a white [cow] gives birth to a black one, and a black one to a white one, and a red one to a dappled one, and a dappled one to a red one.
"Like courser horses seeking renown, / the Somas have stepped forward for wealth"—
thus they approach the form of the introductory rite;
for this day is introductory.
"Being urged on like chariots..."—
that which contains 'chariot' is indeed the form of the introductory rite.
"They have run into the hands, / like the prizes of the victorious; / like kings with praise, the Somas are anointed with milk"—
[verses] containing 'cow' and cattle are used, for securing cattle;
for the Chandomas are cattle.
"Like sacrifice with the seven nourishers..."—
thus they approach the form of the seventh day.

It consists of nine verses.

Nine indeed are the breaths in man.

Thriving through breaths they proceed, establishing themselves in breaths.

And thereby they do not deviate from the Trivṛt stoma.

For whatever is an introductory rite is Trivṛt.