Cattle mortality was investigated on two types of grazing areas, intensively managed Provincial Grazing Reserves and less intensively managed woodland grazing leases. Woodland grazing leases were characterized by being partially or fully surrounded by green space, trees covered majority of land, cattle were checked periodically, and areas were only partially fenced. The Provincial Grazing Reserves were characterized by intense management, removal of trees, seeding of tame forages, fencing and full time supervision. Research found that cattle losses on the woodland grazing leases averaged 2.7 times greater losses than losses on the PGR. Mortality rates for calves born on woodland leases was 5 times higher than those born prior to entering these pastures. The greater mortalities appear to be related to greater forest cover, less intensive management, and greater number and species of predators on the woodland grazing leases than on the PGR. The author suggests that this study does not give precise reasons for the differences, but explains that it could have important management implications. An unimproved woodland grazing area will likely have a greater risk of predation, this should be communicated to livestock producers. Pregnant cows should not be placed on remote woodland pastures either.