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[With 4 Tables & 7 Figs.] Changes in the chemical body composition were studied in 123 specimens of the common vole in the age between 0 and 30 days. The average body weight of voles increases with age (from 1.9 to 16.0 g). The percentages of water, protein and fat are highly correlated with body weight (r = 0.92). The water content in the body of voles decreases with age (from 83.7 to 63.3%) similarly as the content of proteins (from 65.9 to 44.4%). On the other hand the relative fat content increases (from 17.1 to 39.1%), while the ash content remains fairly constant (around 9.5%). In the fat-free biomass the water content decreases, while proteins and ash increase progressively with the age of animals. The energy values of the fat-free dry weight and ash-free dry weight remain on similar level. The index of physiological age expressed by the ratio of protein to water contents shows a rising trend with the body weight and age of voles. The knowledge of bioenergetic processes occurring in a population requires among others investigations of changes in the gross body composition of animals during their postnatal development. The growth of an animal is associated with one of the most important processes of the energy flow, namely the net production. The investigation of retention of particular components and of the energy constitutes an essential step in studying the dynamic changes of the energy value in the animal population. Our knowledge of body composition, components of the body weight increase, as well as energetic values of growth and retention of particular components derives mainly from studies on farm and laboratory animals (B r o d y, 1945; Bailey et al., 1960; B 1 a x t e r, 1962). Investigations of the whole picture of changes of the body composition during * This study was carried out under the Small Mammal Project of the International Biological Programme in Poland.

Changes in the gross body composition and the caloric value of the common voles during their postnatal development