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Effect of Cobalt Supplementation During Late Gestation and Early Lactation on Milk and Serum Measures¹

R. L. Kincaid^*,2 and M. T. Socha

^* Animal Sciences Department, Washington State University, Pullman 99164-6310
Zinpro Corporation Eden Prairie, MN 55344-7298

² Corresponding author: rkincaid{at}wsu.edu

Thirty-six multiparous cows were assigned to a study to determine the effects of dietary Co supplementation during late gestation and early lactation on concentrations of Co in serum and liver, vitamin B₁₂ concentrations in serum and milk, and milk yield. Nonlactating cows received diets containing 0.15, 0.89, or 1.71 mg/ kg of Co (dry matter basis) from 55 d before parturition, and lactating cows received diets containing 0.19, 0.57, or 0.93 mg/kg of Co (dry matter basis) from parturition through 120 d postpartum. Serum vitamin B₁₂ concentrations declined sharply in all cows between 55 and 20 d prepartum. Dietary Co supplementation tended to cause an increase in the concentration of vitamin B₁₂ in colostrum and milk. Cobalt intake did not affect concentrations of Co in liver or serum, but increased the Co concentration of milk (0.089, 0.120, and 0.130 µg of Co/mL) at 120 days in milk. There was no effect of Co supplementation on dry matter intake or yield of milk and milk components. In conclusion, serum concentrations of vitamin B₁₂ are reduced in the early dry period, and added dietary Co may increase ruminal synthesis of vitamin B₁₂ as indicated by a tendency for increased vitamin B₁₂ concentrations in colostrum and milk of cows supplemented with dietary Co.

Key Words: cobalt • vitamin B₁₂ • cattle

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