[Proceedings: Attempt at potentiation by liver extract (L: 500 gammas of vit B12) of the effects a simple intramuscular injection of growth hormone (GH: 2IU), norethandrolone (N:20mg), prolactine (P:1000 IU) 1 hour before death in the intact rat and the combined efforts of these hormones on the oxygen consumption of hepatic homogenates].