Genesis 30:39

36 and he set three days` journey betwixt himself and Jacob: and Jacob fed the rest of Laban`s flocks.

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

38 And he set the rods which he had peeled over against the flocks in the gutters in the watering-troughs where the flocks came to drink; and they conceived when they came to drink.

39 And the flocks conceived before the rods, and the flocks brought forth ringstreaked, speckled, and spotted.

40 And Jacob separated the lambs, and set the faces of the flocks toward the ringstreaked and all the black in the flock of Laban: and he put his own droves apart, and put them not unto Laban`s flock.

41 And it came to pass, whensoever the stronger of the flock did conceive, 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 put them not in: so the feebler were Laban`s, and the stronger Jacob`s.