Abstract

1. Four experiments were conducted using the highly specific mu and delta opioid receptor agonists morphiceptin (B-casomorphin 1-4, amide) or [Met5]-enkephalin, respectively, to evaluate the effect of mu and delta opioid receptor agonists on ingestive behaviour in the domestic fowl. 2. Intracerebroventricular (ICV) administration of 0.625, 1.25, 2.5 and 5.0 micrograms of morphiceptin significantly stimulated drinking, while having no effect on feeding. Intramuscular injection of 0.5, 1.5 and 3.0 mg morphiceptin/kg body weight induced a significant increase in feeding, whereas drinking was not altered. 3. ICV administration of 0.625, 1.25, 2.5 and 5.0 micrograms [Met5]-enkephalin, as well as intramuscular injection of 0.5, 1.5 and 3.0 mg [Met5]-enkephalin significantly stimulated feeding while having no effect on drinking. 4. These results suggest that, in the central nervous system, mu opioid receptor agonists stimulate drinking and delta receptor agonists stimulate feeding. At sites outside the blood-brain barrier, both mu and delta opioid receptor agonists stimulate feeding.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.