Iron stores of liver, spleen and bone marrow, and serum iron concentrations in female dairy cattle in relationship to age.

Storage iron in spleen, liver and bone marrow of cattle significantly increased after three years of age, reached mximal concentrations at five years and remained constant until nine years of age. Storage iron concentrations were always highest in the spleen. In liver and bone marrow much lower concentrations were found. In contrast to storage iron, serum iron remained relatively constant between one and eight years of age.