[1] Univ Bern, Vetsuisse Fac, Vet Publ Hlth Inst, Bern, Switzerland
[2] Charles Sturt Univ, Sch Anim & Vet Sci, Fac Sci, Wagga Wagga, NSW, Australia
[3] NSW Dept Primary Ind, Graham Ctr Agr Innovat, Wagga Wagga, NSW, Australia
[4] Charles Sturt Univ, Wagga Wagga, NSW, Australia
[5] Univ Minnesota, Coll Vet Med, St Paul, MN 55108 USA