Any time the stronger animals in the flock were mating, Jacob put the branches before their eyes. The animals mated near those branches.
Jacob put the branches in front of the flocks at the watering places. When the animals came to drink, they also mated in that place.
Jacob separated the spotted and the black animals from the other animals in the flock. Jacob kept his animals separate from Laban’s.
But when the weaker animals mated, Jacob did not put the branches there. So the young animals born from the weak parents were Laban’s. And the young animals born from the stronger parents were Jacob’s.