Efficacy of doxycycline in feed for the control of pneumonia caused by Pasteurella multocida and Mycoplasma hyopneumoniae in fattening pigs - Bousquet, E; Pommier, P; Wessel-Robert, S; Morvan, H; Benoit-Valiergue, H; Laval, A (Vet Rec., 1998)