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Blood Vitamin B₁₂ Status of the Dairy Cow in Late Pregnancy and Early Lactation¹

Department of Animal Husbandry, Cornell University, Ithaca, New York

ABSTRACT

The vitamin B₁₂ content of the blood of Holstein cows was determined before parturition and at intervals during early lactation to test the hypothesis that a partial depletion of reserves might occur at this time. Blood vitamin B₁₂ levels were found to vary significantly (P < .001) both among cows and among stages of lactation. They were lower preceding parturition and during the first few weeks of lactation than at mid-lactation. There appeared to be little correlation between blood vitamin B₁₂ levels and milk production, grain consumption, or blood glucose levels during early lactation.

¹ Supported in part by a grant from Cooperative Grange League Federation Exchange, Inc.

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