Genesis 30:39

36 He set three days’ journey between himself and Jacob, and Jacob fed the rest of Laban’s flocks.

37 Jacob took to himself rods of fresh poplar, almond, and 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 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 produced streaked, speckled, and spotted.

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

41 Whenever the stronger of the flock conceived, Jacob laid the rods in front of the eyes of the flock in the watering troughs, 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.