Abstract
One of the tasks in the study of the role of vitamins in different species is the study of physiological and biochemical mechanisms of the organism response in the adaptation process to various environmental factors, in particular, the absence of exogenous nutrients. The aim of the work was to study the vitamins A and E content in condition of food deprivation in the tissues of four species: rat, mink, polar fox, and Northern bat. The first three species were subjected to total starvation of different lengths, and Northern bats were in natural conditions during the hibernation. Studies have shown that even short-term fasting, which does not violate the general physiological condition of animals, leads to a change in the vitamins A and E level in the tissues, thus reflects metabolic changes that are associated with adaptation to the economy condition. In species adapted to long-term starvation in the process of evolution, the vitamins content in tissues was subject to less change.