Metabolic changes in early lactation and impaired reproductive performance in dairy cowsRuurd Jorritsma, Theo Wensing, Theo A.M. Kruip, Peter L.A.M. Vos and Jos P.T.M. NoordhuizenVet. Res., 34 1 (2003) 11-26DOI: https://doi.org/10.1051/vetres:2002054