The present invention relates to a composition for a feed additive having a high content of L-methionine and an animal feed composition containing the composition. More particularly, it relates to a composition for a feed additive comprising L-methionine, L-phenylalanine and L-tyrosine at a high content of 60 to 99.90% by weight and an animal feed composition containing the same.本発明は、L-メチオニンの含有量が高い飼料添加剤用組成物及びそれを含む動物飼料組成物に関する。さらに詳しくは、60~99.90重量%の高い含有量のL-メチオニンとL-フェニルアラニン及びL-チロシンを含む飼料添加剤用組成物及びそれを含む動物飼料組成物に関する。