This experiment aimed to analyze the amino acid digestibility of Clostridium autoethanogenum protein in growing pigs. A total of 16 healthy growing pigs fitted with a T?cannula，with an average body weight of（38.2±4.4） kg，were selected for the trial. The experiment lasted 7 days（5?day adaptation period + 2?day trial period）. The pigs were assigned to two treatments，with 8 replicates per group，and were fed either a standardized ileal digestibility （SID）diet formulated with Clostridium autoethanogenum protein or a nitrogen?free diet. The results showed that The crude protein content of Clostridium autoethanogenum protein is 88.57%，with a total energy of 5514 kcal/kg. Among the essential amino acids，the contents of lysine，methionine，and threonine are 8.12% ，1.78% ，and 3.73% ， respectively. The apparent ileal digestibility of crude protein，lysine，methionine，and threonine in Clostridium autoethanogenum protein is 71%，72%，73%，and 74%，respectively，while the standardized ileal digestibility is 82%，87%，85%，and 89%，respectively.

Wheat is the second largest food crop in the world，ranking third in China. The crude protein and crude fiber content of wheat bran produced by its by⁃product processing is higher，and the available energy value is slightly lower than that of corn，which is one of the important energy feed raw materials. However，due to the different sources，processing methods and anti⁃nutrition factors，the nutritional value of wheat bran is very different，which restricts its feeding value. Therefore，this paper mainly reviewed the differences of nutritional components of different wheat bran，the available energy and amino acid digestibility of pigs and their applications in pig production.