After that he separated those young ones. He kept them for himself, he did not put them with Laban's animals. He put the oldish [= mature, matable] animals facing towards Laban's animals. [Laban's animals: The plain ones in Jacob's care, not the non-plain ones that Laban's sons had taken far away. 'Facing' here is taken to be a euphemism for 'mating them with'.]