Genesis 30:37–43

³⁷And Jacob took green rods of poplar, and of almond, and of plane trees, and pilled them in part: so when the bark was taken off, in the parts that were pilled, there appeared whiteness: but the parts that were whole, remained green: and by this means the colour was divers.

³⁸And he put them in the troughs, where the water was poured out; that when the flocks should come to drink, they might have the rods before their eyes, and in the sight of them might conceive.

³⁹And it came to pass, that in the very heat of coition, the sheep beheld the rods, and brought forth spotted, and of divers colours, and speckled.

⁴⁰And Jacob separated the flock, and put the rods in the troughs before the eyes of the rams; and all the white and the black were Laban’s, and the rest were Jacob’s, when the flocks were separated one from the other.

⁴¹So when the ewes went first to ram, Jacob put the rods in the troughs of water before the eyes of the rams, and of the ewes, that they might conceive while they were looking upon them.

⁴²But when the later coming was, and the last conceiving, he did not put them. And those that were lateward, became Laban’s; and they of the first time, Jacob’s.

⁴³And the man was enriched exceedingly, and he had many flocks, maidservants and menservants, camels and asses.