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The study provides information on the blood fluidity in healthy, juvenile sheep and rabbits during growth (n=18), and shows also data from fetal rabbits and cats. In the fetal rabbit (n=3) and cat (n=2), whole blood viscosity (WBV; LS30, Contraves, Switzerland) and plasma viscosity (PV; OCR‐D, Paar, Austria) was low (WBV (0.7 s-1): rabbit: 3.28/3.00/2.44; cat: 7.87/10.88; WBV (94 s-1): rabbit: 2.57/2.48/2.39; cat: 2.75/3.73 mPa s) (PV: rabbit: 1.10/1.10/1.05; cat: 1.27/1.39 mPa s), which was associated with a low plasma protein concentration and a low erythrocyte count despite a high erythrocyte volume. After parturition, blood viscosity increased in rabbits in parallel with hematocrit, while MCV decreased (WBV (0.7 s-1): 9.28 (8.07/10.88); WBV (94 s-1): 3.67 (3.62/3.82); PV: 1.15 (1.15/1.25) mPa s). In contrast, in the sheep, whole blood and plasma viscosity decreased after delivery (WBV (0.7 s-1): 1.31 (0.94/1.88); WBV (94 s-1): 2.45 (2.43/2.85) PV: 1.24 (1.23/1.29) mPa s). Hematocrit and MCV decreased, while erythrocyte count increased under these circumstances. In summary, whole blood viscosity was similar among fetal sheep, rabbits, and cats and is diminished compared to adult individuals to guarantee an optimal oxygen supply during a period of life in which the oxygen maintainance of the child depends on the health and the environment of the mother. However, during growth, blood viscosity rose in rabbits, while it continously decreased in the sheep. At an unknown time point this fall in blood viscosity in lambs must reverse, since adult sheep again show a higher blood viscosity than juvenile lambs at the age of 2 months. [ABSTRACT FROM AUTHOR]