Abstract
An expt. is described involving the production of Co deficiency in lambs on diets of fairly definite chemical composition. In this way the possibility of confusion of results by "unknown pasture factors" is avoided. A diet of 1100 g. flaked corn, 250 g. hay and 60 g. mineral mixture (ground limestone, steamed bone flour and rock salt) per day to pregnant ewes, followed by one of 800 g. flaked corn, 80 g. hay and 25 g. mineral mixture to their lambs daily after weaning, gradually increased to the amts. in the ewes'' diet, was found to induce Co deficiency. Actual ingestion of Co on these diets was 0.0687 mg./day/ewe, and 0.0347-0.0687 mg./day/lamb. Supplementation with 10 mg. Co weekly from birth was sufficient to alleviate the symptoms of Co deficiency.
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