Genesis 30:39 WEB

³⁷  Jacob took to himself rods of fresh poplar, almond, plane tree, peeled white streaks in them, and made the white appear which was in the rods.

³⁸  He set the rods which he had peeled opposite the flocks in the gutters in the watering-troughs where the flocks came to drink. They conceived when they came to drink.

³⁹  The flocks conceived before the rods, and the flocks brought forth streaked, speckled, and spotted.

⁴⁰  Jacob separated the lambs, and set the faces of the flocks toward the streaked and all the black in the flock of Laban: and he put his own droves apart, and didn't put them into Laban's flock.

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;