The present application relates to bio-based N-acetyl-L-methionine and methods for its production. The present application also relates to a feed additive containing the N-acetyl-L-methionine, a feed composition containing the feed additive, and a method for raising the animal, including the step of feeding the animal with the feed composition. [Selection] Figure 1本出願は、バイオベースのN-アセチル-L-メチオニン及びその生産方法に関する。また、本出願は、前記N-アセチル-L-メチオニンを含む飼料添加物、前記飼料添加物を含む飼料組成物及び前記飼料組成物を動物に給餌する段階を含む、動物の飼育方法に関する。【選択図】図1