Genesis 30:38-43 ▼

38 Then he placed the branches that he had stripped bare in all the watering troughs where the flocks came to drink. He placed the branches in front of the flock, and they went into heat as they came to drink.

39 When the flocks mated in front of the branches, they would bear offspring that were striped, speckled, or spotted.

40 Jacob kept the lambs separate, facing the striped and entirely black ones that belonged to Laban's flock. He set his own herd by itself and would not let them be with Laban's flock.

41 Whenever the more vigorous of the flock came into heat, Jacob would place the branches in the troughs in front of the flock to make them mate by the branches.

42 But he didn't put the branches in front of any of the feeble members of the flock. As a result, the feeble ones belonged to Laban, but the stronger ones belonged to Jacob.

43 Therefore the man Jacob prospered so much that he had large flocks, female and male servants, as well as camels and donkeys.