Genesis 30:39-41

International Standard Version

³⁹ When the flocks mated in front of the branches, they would bear offspring^[a] 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.