Genesis 30:41-45

Moreover, whenever the stronger of the flock were mating, Jacob would place the rods in the sight of the flock in the drinking troughs, so that they would mate by the rods;

but when the flock was sickly, he did not put them in; so the sickly were Laban’s, and the stronger were Jacob’s.

So the man became exceedingly prosperous, and had large flocks, and female and male servants, and camels and donkeys.