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Application of L-tryptophan in poultry feed

L-tryptophan is an important nutrient for animals and the third generation feed additive after methionine and lysine. It is an important component of body protein and has significant physiological effects in livestock, poultry, and aquaculture. The metabolite of L-tryptophan, 5-hydroxytryptophan, has anti high-density and weaning stress effects in animals, promoting the production of R-globulin and enhancing the body's disease resistance. L-tryptophan also has an impact on animal behaviour, reducing aggressive behavior and stress response. L-tryptophan can be converted into nicotinamide in animals, thus promoting animal growth; L-tryptophan can also affect the metabolism of fat in animals, reducing the fat content in their liver. The appropriate dosage of L-tryptophan can increase animal feed intake, improve production performance, and feed conversion rate. In addition, L-tryptophan can improve the efficiency of other feed amino acids, such as threonine.
1. Affects poultry feed intake
The feed intake of poultry directly affects their production performance. Adding an appropriate amount of L-tryptophan to their diet can increase their feed intake, but excessive L-tryptophan can inhibit poultry growth.
2. Improving poultry production performance
The production performance of poultry directly affects the economic benefits of breeding enterprises. Adding an appropriate amount of L-tryptophan to the poultry diet can improve the production performance of poultry. Research has shown that adding 0.03% -0.09% L-tryptophan to a diet containing 0.06% L-tryptophan can significantly increase the average daily weight gain of 0-3 week old broilers. Yu Yanhui et al. used Changbai goose as the research object, and the average egg weight of the experimental group increased by 4.46g, which is 1.03 times that of the control group; The average egg production rate was 42.77%, 0.54% higher than the control group.
3. Improve poultry immune function
The thymus and bursa of Fabricius are the central immune organs of poultry and play an important role in humoral and cellular immunity. The spleen is an important peripheral immune organ of poultry and has special significance in poultry immunity. Liu Xiaoting et al. found that adding 0.04% L-tryptophan to the feed of egg ducklings significantly increased their spleen index, while adding 0.06% L-tryptophan significantly increased their thymus index. Adding L-tryptophan to chicken feed can significantly improve α Interferons γ Interferon and IgG levels also play a significant role in the immunity of infectious bursa of Fabricius.
4. Affects nutrient metabolism
L-tryptophan is one of the eight essential amino acids in animals and plays an important role in animal life activities. Adding L-tryptophan to feed can affect the metabolism of nutrients such as fat and protein in poultry.
Research has shown that when L-tryptophan is deficient in the diet, protein deposition in yellow feathered broilers is lower. Adding additional L-tryptophan can increase protein deposition in male and female chickens by 21.0% -31.8% and 5.4% -27.9%, respectively. It has been found that both male and female chickens have the highest protein deposition in the 0.17% L-tryptophan group.
Supplementing L-tryptophan in the basal diet of yellow feathered broilers aged 1 to 21 days can significantly improve the production performance of yellow feathered broilers, increase nitrogen deposition rate and protein deposition, and enhance body fat and abdominal fat deposition. L