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Changes of body weight during pregnancy and lactation as well as food ingested, assimilated and metabolizable energy were recorded. Pregnancy lasted on an average 19.6 days, mean number of born animals was 9.78, and the mean body weight of newborn mouse was 1.14 g. The total amount of metabolizable energy taken by the female in connection with pregnancy was 82.32 Kcal. Caloric value of litter was 10.704 Kcal, placenta 4.004 Kcal. The body weight increase of female itself was observed during pregnancy and lactation. Caloric value of one gram of wet weight of the placenta was 513.7 cal and dry weight 6,306 cal/g. The total amount of metabolizable energy additionally taken by female during 26 days of lactation amounted to 354.224 Kcal.

Variations in the Length and Weight of the Alimentary Tract of Clethrionomys glareolus (Sell re her, 1780) Zmienność dłuyości i ciężaru przewodu pokarmowego Clethiionomys glareolus (Schreber, 1780) [With 2 Figs. & 4 Tables]

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