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Amino acid is the basic unit of protein. It is an organic acid containing amino group. It is composed of carbon, hydrogen, oxygen and other elements. The protein in the feed cannot be directly used by animals, but is decomposed into peptone and peptides by the combined action of digestive enzymes such as pepsin and trypsin, and cannot be used by the organism until the simplest amino acid. Therefore, protein nutrition is actually amino acid nutrition.

Trace elements play a very important nutritional value in animal feed. The importance of trace elements in feed cannot be underestimated, but if it is not added scientifically, the proportion is unreasonable, and small or excessive additions will not play a nutritional role. It may even have a counter-effect, and in severe cases, it may cause symptoms of poisoning in the fed animals.

Trace elements are nutrition elements that occupy a very small share in the feed but are not available. However, because the share is too small, they are often ignored. Trace elements play a key role in the growth and reproduction of pigs. The amount of additions will be discussed with everyone.

Tryptophan is a restricted amino acid for pigs and must be obtained from an exogenous supply. When tryptophan is deficient in livestock and poultry, the conversion efficiency of feed will be reduced, and the animals will suffer from growth stagnation and weight loss.