Genesis 30:39-41

New Living Translation

³⁹ And when they mated in front of the white-streaked branches, they gave birth to young that were streaked, speckled, and spotted. ⁴⁰ 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.

⁴¹ 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.