Growth hormone is secreted by ectopic pituitary grafts and stimulates maternal behavior in rats.

@article{Bridges1988GrowthHI,
  title={Growth hormone is secreted by ectopic pituitary grafts and stimulates maternal behavior in rats.},
  author={Robert S. Bridges and William J. Millard},
  journal={Hormones and behavior},
  year={1988},
  volume={22 2},
  pages={194-206}
}
The onset of maternal behavior at parturition in rats is hormonally regulated. Recently, we reported that treatment of behaviorally inexperienced, hypophysectomized (hypox), ovariectomized (ovx) rats with a sequential steroid treatment of progesterone (P) and estradiol (E2), and either ectopic anterior pituitary grafts or prolactin (PRL), stimulated maternal responsiveness toward foster young. That growth hormone (GH) has a number of PRL-like activities led us to ask whether the actions of PRL… CONTINUE READING