YV 3.6q

If he desire of a man, 'May he have cattle', he should take for him (a piece) with fat; cattle are distinguished by fat; verily by means of their distinctive mark he wins cattle for him, and he has cattle. Prajapati created the sacrifice; he first created the butter [5], in the middle the beast, last the speckled butter; therefore the fore-sacrifices are performed with butter, the beast (is offered) in the middle, and the after-sacrifices with speckled butter. Therefore that is mixed as it were, for it was created last. He offers eleven after-sacrifices; ten are the vital airs of the beast, the body is the eleventh; he offers as many after-sacrifices as is the size of the beast. Now they kill the beast when they dispose of it; the speckled butter is the expiration and the inspiration of cattle; in that he per forms the after-sacrifices with speckled butter, verily he bestows expiration and inspiration upon cattle.