Genesis 30:40

40 Jacob separated the rams from the flock and made the rest of the sheep face any that were striped or black in Laban's flocks. So he made separate herds for himself and did not add them to Laban's flocks.

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 He placed the peeled branches in the troughs directly in front of the flocks, at the watering places where the flocks came to drink. When they were in heat and came to drink,

39 they mated in front of the branches. Then they gave birth to young that were striped, speckled, or spotted.

40 Jacob separated the rams from the flock and made the rest of the sheep face any that were striped or black in Laban's flocks. So he made separate herds for himself and did not add them to Laban's flocks.

41 Whenever the stronger of the flocks were in heat, Jacob would lay the branches in the troughs in front of them so that they would mate by the branches.

42 But when the flocks in heat were weak, he didn't lay down the branches. So the weaker ones belonged to Laban and the stronger ones to Jacob.