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