Photoperiodic regulation of reproductive activity in the ram: evidence for the involvement of circadian rhythms in melatonin and prolactin secretion.

@article{Almeida1982PhotoperiodicRO,
  title={Photoperiodic regulation of reproductive activity in the ram: evidence for the involvement of circadian rhythms in melatonin and prolactin secretion.},
  author={Osborne FX Almeida and Gerald A. Lincoln},
  journal={Biology of reproduction},
  year={1982},
  volume={27 5},
  pages={1062-75}
}
Adult Soay rams were housed under long days of 16L:8D for 16 weeks, and then exposed to a lighting regimen of either 8L:40D, 8L:28D, 8L:16D or maintained under 16L:8D. The diameter of the testes and the intensity of the sexual skin flush was recorded every 1-2 weeks, while on four occasions during the 8L:40D and 8L:28D regimens the concentrations of melatonin, prolactin and electrolytes (sodium and potassium) were measured in blood samples collected hourly for 2-4 days. During the initial… CONTINUE READING

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