title: AUTHOR RESPONSE.
authors.affiliation: Department of Veterinary Medicine, University of Cambridge, Cambridge, UK.
authors.forename: Aleksandra
authors.initials: A
authors.lastname: Marcinowska
authors.affiliation: Department of Veterinary Medicine, University of Cambridge, Cambridge, UK.
authors.forename: James
authors.initials: J
authors.lastname: Warland
authors.affiliation: Department of Veterinary Medicine, University of Cambridge, Cambridge, UK.
authors.forename: Malcolm
authors.initials: M
authors.lastname: Brearley
authors.affiliation: Department of Veterinary Medicine, University of Cambridge, Cambridge, UK.
authors.forename: Jane
authors.initials: J
authors.lastname: Dobson