Genesis 30:40

Jacob set the faces of the flocks toward the ring-streaked Having used the pilled rods by divine direction, and seeing the effects they produced, he here employs his own natural sagacity, and turns the faces of Laban's flocks toward the ring-streaked and the brown, that by looking frequently on them, they might be disposed in their conception to bring forth the like. And he put his own flocks apart, lest, by looking at Laban's, their young might fall off from being ring-streaked and brown.