Genesis 30:33-42

In the future, when you check on the animals you have given me as my wages, you’ll see that I have been honest. If you find in my flock any goats without speckles or spots, or any sheep that are not black, you will know that I have stolen them from you.” “All right,” Laban replied. “It will be as you say.” But that very day Laban went out and removed the male goats that were streaked and spotted, all the female goats that were speckled and spotted or had white patches, and all the black sheep. He placed them in the care of his own sons, who took them a three-days’ journey from where Jacob was. Meanwhile, Jacob stayed and cared for the rest of Laban’s flock. Then Jacob took some fresh branches from poplar, almond, and plane trees and peeled off strips of bark, making white streaks on them. Then he placed these peeled branches in the watering troughs where the flocks came to drink, for that was where they mated. And when they mated in front of the white-streaked branches, they gave birth to young that were streaked, speckled, and spotted. Jacob separated those lambs from Laban’s flock. And at mating time he turned the flock to face Laban’s animals that were streaked or black. This is how he built his own flock instead of increasing Laban’s. Whenever the stronger females were ready to mate, Jacob would place the peeled branches in the watering troughs in front of them. Then they would mate in front of the branches. But he didn’t do this with the weaker ones, so the weaker lambs belonged to Laban, and the stronger ones were Jacob’s.