Analyses of different compounds in the plasma of healthy sheep before birth were conducted from day 70 to 43 (group 1), 42 to 22 (group 2), 21 to 15 (group 3), 14 to 8 (group 4) and 7 to 1 (group 5). There were significant differences in the concentration of ascorbic acid, total protein, total alpha-Amino-N, glucose, 3-hydroxybutyrate and of adenosine deaminase in the plasma between several groups, their significance is discussed. There was no difference in the concentration of cholesterol in the plasma of the sheep of the 5 groups. The content of ascorbic acid in 14 different tissues of sheep of the age of 6 and 12 months was analysed. There were significant differences between the 2 groups in the levels of ascorbic acid of the cerebrum and cerebellum, the hypophysis, the lungs, the kidneys and the spleen.