Apoptosis and necrosis of blood and milk polymorphonuclear leukocytes in early and midlactating healthy cows Kaat Van Oostveldt, Frédéric Vangroenweghe, Hilde Dosogne and Christian Burvenich Vet. Res., 32 6 (2001) 617-622 DOI: 10.1051/vetres:2001143