Could peeled rods make Jacob’s flocks bear striped and spotted young?

Genesis tells us what Jacob did; it does not say that the rods worked. The narrator reports the trick and the result without comment. When Jacob himself explains the result to his wives, he gives the credit to God, not to his rods: “Thus God hath taken away the cattle of your father, and given them to me” (31:9). He tells of a dream at the time the flocks conceived, in which he saw that the rams were “ringstraked, speckled, and grisled”, and heard the angel say, “I have seen all that Laban doeth unto thee” (31:10–12). Laban changed the terms ten times, and each time the flocks bore the kind that was to be Jacob’s (31:7–8). No breeding method can do that. The Bible’s own explanation is God’s care for Jacob against Laban’s cheating.

Genetics fits this better than it fits the critic’s reading. Laban removed every spotted and coloured animal (30:35), but plain sheep and goats can carry hidden (recessive) genes for spotted coats, and two such carriers can have spotted young. The dream showed Jacob which way the flocks were going. Jacob also bred with care: he used the rods only when the stronger animals mated, so “the feebler were Laban’s, and the stronger Jacob’s” (30:41–42).

The same chapter shows the pattern elsewhere. Rachel bargained for mandrakes, which were thought to help a woman conceive (30:14–16), yet she bore a son only when “God remembered Rachel, and God hearkened to her, and opened her womb” (30:22). Genesis records what people believed and tried, and then shows that God gave the result. Older commentators such as Gill and Keil and Delitzsch did believe that sight at mating marked the young; that belief was theirs, not the text’s.

Something in the bark

Answers in Genesis has suggested that the peeled poplar, almond and plane wood in the water may have had a real effect on the animals’ health or fertility. This is a guess; the text gives no such reason.

A sign of Jacob’s scheming

Got Questions reads the rods as Jacob relying on his own cleverness, when God had already promised to bless him. The story then shows God’s faithfulness to a man who was still learning to trust him.

Commentators differ over when Jacob had the dream: before his scheme, to guide it, or later, to show him that his success came from God and not from his rods. Keil and Delitzsch thought the matter hard to decide.