BONE MARROW VOLUME IN ADULT DOGS

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Abstract
2 young adult dogs (litter mates) in the anemia colony showed marrow volumes of 289 cc. (2.4% body wt.) and 314 cc. (1.9%), the lower % (1.9) being due to increased body wt. (fat). The marrow volumes or weights in these 2 dogs are about 2/3 of the liver wts. (61 and 67%). It is obvious that marrow volume will be relatively higher in animals in poor nutrition and still higher when age introduces osteoporosis. It may be that a more stable ratio for comparison will be the liver-marrow ratio, as body nutrition has relatively slight influence on the liver and bone marrow volumes. The ratio of red to fat marrow is constantly fluctuating due to age, anemia and other factors related to production, maintenance and conservation of Hb. This ratio may vary from 100% red marrow with fat excluded to 20% red and 80% fat marrow, both extremes observed in the anemic dog. The parent red cells in the red marrow under optimum conditions in a 2-wk. period may produce many times their own volume of mature red cells.

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