Genesis 30:36

And Laban said, Behold, I would it might be according to thy word.

And he removed that day the he goats that were ringstraked and spotted, and all the she goats that were speckled and spotted, [and] every one that had [some] white in it, and all the brown among the sheep, and gave [them] into the hand of his sons.

And Jacob took him rods of green poplar, and of the hazel and chesnut tree; and pilled white strakes in them, and made the white appear which [was] in the rods.

And he set the rods which he had pilled before the flocks in the gutters in the watering troughs when the flocks came to drink, that they should conceive when they came to drink.