Genesis 30:43 WEB

⁴¹  It happened, whenever the stronger of the flock conceived, that Jacob laid the rods before the eyes of the flock in the gutters, that they might conceive among the rods;

⁴²  but when the flock were feeble, he didn't put them in. So the feebler were Laban's, and the stronger Jacob's.

⁴³  The man increased exceedingly, and had large flocks, maid-servants and men-servants, and camels and donkeys.