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Influence of Dietary Cobalt on Fecal Vitamin B₁₂ and Blood Composition in Lambs¹

Auburn University, Auburn, Alabama²

Abstract

Cobalt is a structural part of the vitamin B₁₂ molcule and is necessary for the synthesis of this vitamin in the rumen by micro-organisms (Abelson and Darby, 1949; Hale et al, 1950; Rickes et al., 1948; Smith, 1948). Dawbarn, Hine and Hughes (1952) postulated that the concentration of vitamin B₁₂ in the feces of sheep was dependent on the level of available cobalt in the gut. Bentley et a/l. (1954) found that the vitamin B₁₂ content of dried steer feces increased when a purified type ration was supplemented with alfalfa ash, a trace mineral mixture, or cobalt chloride. Pearson, Struglia and Lindahl (1953) reported that the composition of the ration may have a direct effect on the activity of rumen organisms that synthesize vitamin B₁₂ If the synthesis of vitamin B₁₂subthe rumen is sensitively related to dietary cobalt then fecal vitamin B12 might be used as an indicator of the dietary cobalt status of the animal.

¹ Part of a thesis submitted to the Graduate School of Auburn University by Oscar H. Jones, Jr., in partial fulfillment of the requirements for the M.S. Degree.

² Department of Animal Science, Alabama Agricultural Experiment Station.

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