Genesis 30:37-39

21st Century King James Version

³⁷ And Jacob took rods of green poplar and of the hazel and chestnut tree, and peeled white strips in them and made the white appear which was in the rods.

³⁸ And he set the rods which he had peeled 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.

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