This research aimed to study the effect of central infusion of sericin and possible interferences with dopaminergic and adrenergic receptors on the feed consumption of neonatal chickens. This study included 11 experiments with 4 groups in each group with 11 replications. In the first experiment, group 1 received ICV administration of the saline, and groups 2-4 received ICV injection of the sericin (0.125, 0.25, and 0.5 nmol), respectively. In the second experiment, saline, sericin (0.5 nmol), D1 receptor antagonist (SCH23390, 5 nmol), and Sericin + SCH23390 were administered. In experiments 3-11, AMI-193 (5 nmol), NGB2904 (6.4 nmol), L-741,742 (6 nmol), 6-OHDA (2.5 nmol), parazosin (10 nmol), yohimbine (13 nmol), metoprolol (24 nmol), ICI 118,551 (5 nmol), and SR 59230R (20 nmol) were injected instead of SCH23390. Then feed consumption was monitored up to 2 hours after the administration. Also, behavioral changes including the number of steps, jumps, feeding, drinking, and exploratory pecks were recorded for 30 minutes. According to findings, central infusion of sericin (0.25, and 0.5 nmol) declined meal consumption (P<0.05). Co-administration of the SCH23390 plus sericin meaningfully attenuated hypophagic effect of the sericin (P<0.05). Co-infusion of the ICI 118,551 plus sericin lessened sericin-induced hypophagia (P<0.05). Sericin significantly reduced the number of steps, jumps, exploratory, and feed peckings (P<0.05). These findings suggested sericin has hypophagic role in chicken and its effect mediates via D1 dopaminergic and β2 adrenergic receptors.o-infusion of the ICI 118,551 plus sericin lessened sericin-induced hypophagia (P<0.05). Sericin significantly reduced the number of steps, jumps, exploratory, and feed peckings (P<0.05). These findings suggested sericin has hypophagic role in chicken and its effect mediates via D1 dopaminergic and β2 adrenergic receptors. |