Hafez Y S, Chavez E, Vohra P, Kratzer F H
Poult Sci. 1978 May;57(3):699-703. doi: 10.3382/ps.0570699.
In feeding experiments with poults, 2% DL-methionine caused a marked growth depression which could be alleviated by the addition of glycine. Homocystine at an equimolar level depressed growth to a lesser degree than methionine, and this growth depression could be alleviated by glycine. Betaine could alleviate the growth depression of homocystine but not that of methionine. Methionine-fed poults developed a cervical paralysis similar to that of a folic acid deficiency, but the addition of this vitamin at several times the requirement was ineffective in counteracting the toxicity of methionine in either chicks or poults.
在对幼禽进行的饲养实验中，2%的DL-蛋氨酸导致明显的生长抑制，而添加甘氨酸可缓解这种抑制。等摩尔水平的高胱氨酸对生长的抑制程度低于蛋氨酸，且这种生长抑制可被甘氨酸缓解。甜菜碱可缓解高胱氨酸引起的生长抑制，但不能缓解蛋氨酸引起的生长抑制。喂食蛋氨酸的幼禽出现了类似于叶酸缺乏导致的颈部麻痹，但在需求的几倍剂量下添加这种维生素，对抵消蛋氨酸对雏鸡或幼禽的毒性均无效。
