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Leger, E., Dohoo, I. R., Keefe, G. P., Wichtel, J., Arunvipas, P., & VanLeeuwen, J. A. (2002). Observational study of factors associated with seasional variation in milk urea nitrogen observed on intensively and extensively managed pastures, during the summer 2000 grazing period in Prince Edward Island, Canada. In Proceedings of the American Dairy Science Association. Quebec.