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Swine Nutrition and Feed Technology
Asian-Australasian Journal of Animal Sciences 1996;9(3): 255-259.
DOI: https://doi.org/10.5713/ajas.1996.255    Published online June 1, 1996.
Intracerebroventricularly administered phenylalanine and tyrosine : effects on feeding behaviour and norepinephrine concentrations of specific brain sites in the chicken
Y. -H. Choi, M. Furuse, J. Okumura, Y. Shimoyama, K. Sugahara, D. M. Denbow
Abstract
A study was carried out to investigate the action of central L-pheylalanine(Phe) and L-tyrosine(Tyr) on food intake of the chicken. In the first trial, Phe(200 關g/10 關l) or saline was acutely administered into the right lateral ventricle(i.c.v.) of chickens(5 birds per each group). Birds(4 birds per each group) were administered with the i.c.v. Tyr(200 關g/10 關l) or saline in the second trial. The brains of the birds were removed for catecholamine assy 30 min postadministration. Catecholamine concentrations were measured at specific sites of the brain(LH: lateral hypothalamus, PVN: paraventricular nucleus, and VMH: ventromedial hypothalamus). No significant effect of amino acids on the concentration of norepinephrine of brain sites investigated was detected. Food intake and rectal body temperature were also monitored for 6 h after central administrations of Phe, Tyr or saline(5 birds per each group). Both Phe and Tyr, up to 1 mg/10 關l, failed to modulate food intake or rectal body temperature.
Keywords: Phenylalanine; Tyrosine; Food Intake; Chicken; I.C.V. Injection
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