Genesis 30:40

40 And Jacob separated the flock, and put the rods in the [water] troughs, before the eyes of the rams (And so Jacob separated out the flock, and put up the branches in the water troughs, before the eyes of the rams). Soothly all the white and [the] black were Laban's; soothly all the others were Jacob's; for the flocks were separated (out) betwixt themselves.

Genesis 30:40 Meaning and Commentary

Genesis 30:40

And Jacob did separate the lambs
The ringstraked, speckled, and spotted; and set the faces of the flocks,
that were all white, towards the ringstraked, and all the brown in the flock of Laban;
either to go before those that were all white, that they by looking at them might conceive and bring forth such, which was another artifice of Jacob's to increase his own sheep; or else he set at the water troughs the white sheep on one side of them, and on the opposite side the speckled ones that the same effect might also be produced the more successfully both by the rods and by the speckled lambs: and he put his own flocks by themselves, and put them not unto Laban's
cattle;
partly that they might not be mixed together, but kept distinct, that what was his property might be discerned from Laban's; and partly, lest his spotted ones, being mixed with Laban's white sheep, by continual looking at them, should conceive and bring forth such likewise, and so his flocks be lessened.

Genesis 30:40 In-Context

38 And Jacob put those rods in the troughs, where the water was poured out, that when the flocks should come to drink, (And Jacob put up those branches in the troughs, where the water was poured out, so that when the flocks would come to drink,)

39 they should have the rods before their eyes, and they should conceive in [the] sight of the rods. And it was done that in that heat of riding, or engendering, the sheep should behold those rods, and that they should bring forth spotted beasts, and diverse, and besprinkled with diverse colour. (they would have the branches before their eyes, and they would conceive in front of the branches. And so it was done that in the heat of riding, or of begetting, the sheep saw those branches, and later they brought forth beasts that were spotted, and diverse, and besprinkled with diverse colour, like the branches were.)

40 And Jacob separated the flock, and put the rods in the [water] troughs, before the eyes of the rams (And so Jacob separated out the flock, and put up the branches in the water troughs, before the eyes of the rams). Soothly all the white and [the] black were Laban's; soothly all the others were Jacob's; for the flocks were separated (out) betwixt themselves.

41 Therefore when the sheep were ridden in the first time, Jacob put the rods in the water troughs before the eyes of rams, and of ewe sheep, that they should conceive in the sight of the rods. (And so when the sheep were ridden by the stronger rams, Jacob put up the branches in the water troughs before the eyes of the rams, and the ewe sheep, so that they would conceive in front of the branches.)

42 Forsooth when the late mixing, or engendering, and the last conceivings were, Jacob put not (up) those rods; and those that were late engendered, were made Laban's, and those that were of the first time engendered, were Jacob's. (But when the weaker rams mated, Jacob did not put up the branches; and so the weaker offspring were made Laban's, and the stronger ones were made Jacob's.)