Abstract
Blood volumes of 51 horses of three different breeds were determined by means of radioisotopes Cr51 and Fe59. The mean values obtained in 34 determinations for 31 Thoroughbred English race horses are as follows: total blood volume, 10.31; plasma volume, 6.33; and red cell volume 3.98 liters/100 kg body weight for a hematocrit of 42.7%. The results for 6 saddle horses are: 7.75, 5.25, and 2.53, respectively, for a hematocrit of 37.3%. The results in 14 draft horses are: 6.14, 4.35, and 1.82 for a hematocrit of 33.5%. The differences observed in the blood volume values of the three breeds are statistically significant. In our opinion, these differences are due to their physiological qualities, according to the breed.
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