Lacy M P, Van Krey H P, Denbow D M
Poult Sci. 1984 Jan;63(1):176-81. doi: 10.3382/ps.0630176.
The serotonergic and catecholaminergic systems have been shown to affect both tonic immobility and food intake in the domestic fowl. Tryptophan, the amino acid precursor of serotonin, has been demonstrated to influence tonic immobility and food intake when injected intraperitoneally. Tyrosine, amino acid precursor of the catecholamines, is also known to affect food intake when administered orally. In two experiments, tryptophan and tyrosine were intubated intragastrically into male chickens at levels known to affect food intake, and their effect on tonic immobility was measured. Tryptophan and tyrosine delivered intragastrically had no effect on either duration or susceptibility of tonic immobility. These data suggest that changes in appetite observed as a result of orally administered tyrosine and tryptophan were not due to a general inhibition or stimulation of the central nervous system.
血清素能和儿茶酚胺能系统已被证明会影响家鸡的强直性静止和食物摄入量。色氨酸作为血清素的氨基酸前体，经腹腔注射已被证实会影响强直性静止和食物摄入量。酪氨酸作为儿茶酚胺的氨基酸前体，口服时也已知会影响食物摄入量。在两项实验中，将色氨酸和酪氨酸以已知会影响食物摄入量的水平经胃管灌喂给雄性鸡，并测量它们对强直性静止的影响。经胃给予色氨酸和酪氨酸对强直性静止的持续时间或易感性均无影响。这些数据表明，口服酪氨酸和色氨酸后观察到的食欲变化并非由于对中枢神经系统的普遍抑制或刺激所致。
