Caldwell, Vincent, Luc DesCoteaux, Emile Bouchard, Denis DuTremblay, Ian R. Dohoo, and Fred Markham. 2002. “Gastrointestinal Nematodes in Quebec Dairy Cattle: Herd Prevalence, Level of Infection Estimated by Bulk Tank Milk ELISA Testing and Related Risk Factors”. The Bovine Practitioner 36 (2):117-25. https://doi.org/10.21423/bovine-vol36no2p117-125.