SUMMARY

Majority of nutrients required in diets of animals for growth, reproduction and maintenance have been identified. However, probably that there is more unidentified nutrients. Certainly that these nutrients required in extremly small quontities, as contaminants in environment or are present in unmeasuring quontities in diets of animals, for which are not established metabolic functions.

In opposite to known and applied in feeding of domestic animals, however is clierly that many problems connected for nutrition need to be solved. It is needed to investigate about relationships of many nutrients, as between nutrition and genetics, nutrition and diseases and nutrition and other factors including outer and fisiological factors, which Affect to availability of nutrients in feedstuffs. Quintative requirements in specific nutrients in diets of different species of animals are changing according to the genetic changing, as the results of selection of animals for the specific purposes of the economic significance, by the including of foreign genes or modification of genes by the methods of modern molecular biology.

Adequate nutrition was the component of success in production of high producing animals. With increase number of the people on this planet and his economical power, requirement in food are every days a more and more.