| prevalence and distribution of gastrointestinal nematodes on 32 organic and conventional commercial sheep farms in ontario and quebec, canada (2006-2008). | in order to characterize the epidemiology of sheep gastrointestinal nematodes in organic and conventional flocks in canada, a longitudinal study was carried out from may 2006 to march 2008 on 32 purposively selected farms in ontario (on) and quebec (qc): 8 certified organic (co), 16 non-certified organic (nco), and 8 conventional (c) farms. on each farm, 10 ewes and 10 female lambs were selected. farm visits were undertaken monthly during the grazing season, and twice in the winter. at each visi ... | 2010 | 20236769 |