A migratory songbird (Dark-eyed Junco Junco hyemalis) was used as a model for studies on the endorphinergic regulation of food intake. When administered intramuscularly to ad libitum-fed birds, the opioid antagonist naloxone dose-dependently reduced food consumption during the first hour post-injection, suggesting that opioid mechanisms participate in the control of feeding in this species. Food consumption was not influenced by an injection at various doses of the specific delta agonist BUBUC. It was attenuated by an injection of the specific kappa agonist U-50,488H, possibly because this drug either induced a nonselective behavioral inhibition or affected peripheral opioid receptors. These data do not provide evidence that the anorexic influence of naloxone in juncos results from the stimulation either of delta or of kappa receptors.
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Ornis Scandinavica (Scandinavian Journal of Ornithology)
© 1992 Nordic Society Oikos