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Relative Concentration of Vitamin B₁₂ in the Organs of the Male Rat as Affected by its Intake of the Vitamin

Animal Husbandry Research Division, Agricultural Research Service, United States Department of Agriculture, Beltsville, Maryland

The concentrations of vitamin B₁₂ in certain organs of the male rat were studied under conditions where the animal was deficient in the vitamin and where it was fed ample quantities. The kidneys stored large amounts when an abundant supply was available. The pituitary and the adrenals also contained high concentrations, equal to or not far below those in the kidneys of vitamin B₁₂-deficient rats but much less than those in the kidneys of vitamin B₁₂-sufficient rats. The heart contained fair amounts when the vitamin was supplied. The other tissues studied contained much smaller concentrations, the testes and seminal vesicles having particularly low amounts when the rat was deficient in the vitamin. Rats aged 189 to 301 days differed little from those aged 62 to 77 days of age in respect to the vitamin B₁₂ concentration in their tissues, except for slightly greater storage in a few of the tissues in the older group when the vitamin was administered.