Organic trace elements are widely used in animal feed. Among them, chelates attracted particular attention. The review gives a general description of chelates with amino acids and protein hydrolysates, focuses on the stability constants of chelates and its significance for nutritional benefits. The results of numerous evaluations of the effectiveness of the use of organic metal compounds are ambiguous due to the lack of understanding of the mechanisms of their assimilation and the lack of ways to influence this process. In recent years, new scientific facts have appeared that cannot be explained by this argument. They include: the same effect in several cases on the productivity of animals of organic and inorganic sources; increased productivity under the influence of one of the organic compounds of trace elements, as well as their complex; better productivity when using organic and inorganic sources of trace elements in comparison with organic. Based on the analysis of published works, problems are identified that require further study in Russia and Uzbekistan.
Valery Kryukov, Sergey Zinoviev, Vladimir Galetsky, Dilshod Yuldashev, Michael Moltaraus