Changes in the hypothalamic-hypophyseal axis of mares in relation to the winter solstice.

@article{Silvia1992ChangesIT,
  title={Changes in the hypothalamic-hypophyseal axis of mares in relation to the winter solstice.},
  author={Pilati Silvia and Larry H. Johnson and Barry P. Fitzgerald},
  journal={Journal of reproduction and fertility},
  year={1992},
  volume={96 1},
  pages={195-202}
}
In mares, the amount of gonadotrophin-releasing hormone (GnRH) is low in the hypothalamus during seasonal anoestrus, but by early spring, concentrations of GnRH are high. The timing of this response was characterized more precisely by determining concentrations of GnRH in hypothalamic tissue collected immediately before and at various times after the winter solstice (22 December 1986). Ovaries, pituitary gland, hypothalamus and a blood sample were collected from six groups of mares (6-12 mares… CONTINUE READING