NPY increases food intake in white-crowned sparrows: effect in short and long photoperiods.

@article{Richardson1995NPYIF,
  title={NPY increases food intake in white-crowned sparrows: effect in short and long photoperiods.},
  author={Rory D Richardson and Tim Boswell and Brian Raffety and Randy J Seeley and John C Wingfield and Stephen Woods},
  journal={The American journal of physiology},
  year={1995},
  volume={268 6 Pt 2},
  pages={R1418-22}
}
To determine if altered sensitivity to neuropeptide Y (NPY) underlies premigratory fattening, white-crowned sparrows held on short day length (9:15-h light-dark) received injections into the third ventricle (ivt) of saline or several doses of NPY. An inverted-U function occurred with food intake increasing 30 and 60 min after doses of 1.0 and 2.0 micrograms NPY. When photostimulated (20:4-h light-dark), birds increased daily caloric intake and gained weight rapidly. Birds maintained on long day… CONTINUE READING