Effect of strategic gastrointestinal nematode control on faecal egg count in traditional west African cattle Jakob Zinsstag, Philippe Ankers, Mamud Njie, Pradeep Itty, Vincent Monsan, Johannes Kaufmann, Tom Smith, Vijay S. Pandey and Kurt Pfister Vet. Res., 31 2 (2000) 259-266 DOI: 10.1051/vetres:2000114