From the link above
Q. Genesis chapter 30, versus 32 thorugh 43 describes how Jacob received his payment from Laban. Would you please explain these verses (the purpose of the fresh-cut branches) and how it led to Jacob becoming properous? These versus seem not to make sense from what we know about genetics.
The passage reads:
Genesis 30:32-43 (NASB95 edition)
32 let me pass through your entire flock today, removing from there every speckled and spotted sheep and every black one among the lambs and the spotted and speckled among the goats; and such shall be my wages.
33 "So my honesty will answer for me later, when you come concerning my wages. Every one that is not speckled and spotted among the goats and black among the lambs, if found with me, will be considered stolen."
34 Laban said, "Good, let it be according to your word."
35 So he removed on that day the striped and spotted male goats and all the speckled and spotted female goats, every one with white in it, and all the black ones among the sheep, and gave them into the care of his sons.
36 And he put a distance of three days' journey between himself and Jacob, and Jacob fed the rest of Laban's flocks.
37 ¶ Then Jacob took fresh rods of poplar and almond and plane trees, and peeled white stripes in them, exposing the white which was in the rods.
38 He set the rods which he had peeled in front of the flocks in the gutters, even in the watering troughs, where the flocks came to drink; and they mated when they came to drink.
39 So the flocks mated by the rods, and the flocks brought forth striped, speckled, and spotted.
40 Jacob separated the lambs, and made the flocks face toward the striped and all the black in the flock of Laban; and he put his own herds apart, and did not put them with Laban's flock.
41 Moreover, whenever the stronger of the flock were mating, Jacob would place the rods in the sight of the flock in the gutters, so that they might mate by the rods;
42 but when the flock was feeble, he did not put them in; so the feebler were Laban's and the stronger Jacob's.
43 So the man became exceedingly prosperous, and had large flocks and female and male servants and camels and donkeys.
Dr. John T. Willis in the "Living Word Commentary" writes:
"After jacob completes his seven years of service for Rachel, he asks Laban for permission to return to his home in Beer-sheba (vss. 25-26; cf. 26:33). Laban urges him to stay, declaring that he had learned by divination that God had blessed him because of Jacob and offering to give him any wage he might ask (vss. 27-30). Jacob agrees to stay if Laban will give him every speckled and spotted sheep, every black lamb, and every speckled and spotted goat. Since these types are rare, Laban gladly accepts Jabob's terms, and then promptly removes all the older speckled and spotted sheep and goats and the black lambs and sends them a three day's journey away under the care of his sons so that Jacob could not get what he had agreed to give him. But Jacob has the strong members of Laban's flock breed before fresh rods of poplar, almond, and plane with peeled white streaks in them and practices selective breeding (vs. 40). The flocks produce large numbers of speckled and spotted sheep and goats and black lambs, so that Jacob's flocks increased and Laban's decrease. Over a period of seven years (cf. 31:38, 41), Jacob becomes very rich (vss. 31-43).
It should be noted that Laban (by divination, vs. 27) and Jacob (by magical power of suggestion, vss. 37-39) used pagan superstition to accomplish their purposes. However, by reporting such practices, the biblical writer is not expressing his own belief in their validity, commending their use, or encouraging his readers to adopt them."
My own view, after careful consideration of the context is this: Jacob indeed involves himself in the practice of local superstitions. The reason for his prosperity, however, was a result of the blessing of God, and not related to any of his breeding techniques or superstitious activities.
The Bible often records the activities of men without endorsing their actions.
Clyde M. Woods says:
"There seems to be no valid scientific evidence that the procedure Jacob followed would ordinarily work, although ancient peoples had confidence in such devices.LATER, Jacob learned that his success was due, not to his ingenious and somewhat questionable devices, but rather to God's providential care which prevented Laban from defrauding him (see Genesis 31:7.9.12).