1. Methionine Methionine is the first limiting amino acid in chicken feed. When broiler diets lack methionine, the ability to produce antibodies is reduced. The level of dietary methionine has a very important relationship with chicken immune function. 0.063%, 0.125%, and 0.25% methionine were added to the broiler diet, and serum antibody titers, Ig G, and Ig M levels were measured. The results showed that with the increase of dietary methionine level, the serum antibody titer, Ig G content and lymphocyte transformation rate of broiler chickens increased significantly, but had no significant effect on the content of Ig M, and high levels of methionine could significantly improve the broiler chickens. body weight. It indicates that in addition to speeding up the growth rate of broilers, methionine can also improve the immune function of chickens.
2. Proline Proline is the main component of chicken Y-globulin. In the absence or deficiency of proline in the diet, the ability to synthesize antibodies in chickens is reduced. The broiler diet was supplemented with 0.5% to 1.5% proline. The NDV vaccine was inoculated and the lethality was reduced from 40% to 0, while the antibody titer was increased from 2.751og2 to 5.31og2. Moreover, with the increase of dietary proline levels, the growth rate of broilers accelerated, indicating that proline has an important effect on chicken immunity. High levels of proline can enhance chicken immunity and promote growth.
Other amino acids were measured for the lack, sufficient and excess levels of threonine in broiler fed diets, and their antibody titers against SRBC were determined. Serum SRBC antibody titers were increased with dietary threonine levels. Gradually increasing, the growth rate of broilers is accelerated, and the feed conversion rate is increased. Too low or too high a dietary lysine level will result in a reduced ability of broilers to synthesize antibodies.
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