Genesis 30:39-41

New Century Version

³⁹ so the flocks mated in front of the branches. Then the young that were born were streaked, speckled, or spotted. ⁴⁰ Jacob separated the young animals from the others, and he made them face the streaked and dark animals in Laban’s flock. Jacob kept his animals separate from Laban’s. ⁴¹ When the stronger animals in the flock were mating, Jacob put the branches before their eyes so they would mate near the branches.