Thematic Bible: Facts about breeding

But that same day [Laban] removed the he-goats that were streaked and spotted and all the she-goats that were speckled and spotted, every one that had white on it, and every black lamb, and put them in charge of his sons. And he set [a distance of] three days' journey between himself and Jacob; and Jacob was then left in care of the rest of Laban's flock. But Jacob took fresh rods of poplar and almond and plane trees and peeled white streaks in them, exposing the white in the rods. read more.
Then he set the rods which he had peeled in front of the flocks in the watering troughs where the flocks came to drink. And since they bred and conceived when they came to drink, The flocks bred and conceived in sight of the rods and brought forth lambs and kids streaked, speckled, and spotted. Jacob separated the lambs, and [as he had done with the peeled rods] he also set the faces of the flocks toward the streaked and all the dark in the [new] flock of Laban; and he put his own droves by themselves and did not let them breed with Laban's flock. And whenever the stronger animals were breeding, Jacob laid the rods in the watering troughs before the eyes of the flock, that they might breed and conceive among the rods. But when the sheep and goats were feeble, he omitted putting the rods there; so the feebler animals were Laban's and the stronger Jacob's. Thus the man increased and became exceedingly rich, and had many sheep and goats, and maidservants, menservants, camels, and donkeys.

If he said, The speckled shall be your wages, then all the flock bore speckled; and if he said, The streaked shall be your hire, then all the flock bore streaked. Thus God has taken away the flocks of your father and given them to me.