Effect of cobalt supplementation on serum vitamin B₁₂ levels, weight gain and survival rate in lambs grazing cobalt‐deficient pastures

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• Corresponding author. Mailing address: Animal Health Service in the Northern Netherlands, P.O. Box 361, 9200 AJ Drachten, the Netherlands. Phone: (0)512 570700. Fax: (0)512 520013.
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• Department of Herd Health and Reproduction. Faculty of Veterinary Medicine, Utrecht University, P.O Box 80151, 3508 TD Utrecht, the Netherlands
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