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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.
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