Genesis 30:37-39

37And Jacob took fresh rods of white poplar, almond-tree, and maple; and peeled off white stripes in them, uncovering the white which was on the rods.

38And he set the rods which he had peeled before the flock, in the troughs at the watering-places where the flock came to drink, and they were ardent when they came to drink.

39And the flock was ardent before the rods; and the flock brought forth ringstraked, speckled, and spotted.