At their first lambing, most ewes have single lambs. Ewes tend to be shorn immediately prior to lambing. The number of lambs a ewe produces per year is known as the lambing percentage. Jackals can be a serious problem for sheep farmers, particularly during the lambing season. Balancing ease of lambing with high productivity is one of the dilemmas of sheep breeding. Lambing time further increased the shepherd's responsibilities. Humble now owns her own farm after working on "Lambing Live". Gheorghe, a Romanian migrant worker, is hired as extra help for the lambing season. Zwartbles are known for being docile, friendly, easy lambing, prolific, milky and being excellent mothers. They produce good milk and are good mothers with a lambing percentage of about 150%. The effect of the traditional Filipino tampo on non-Filipino partners breaks the normal Tampo/Lambing cycle. May. Most births occur in the first two weeks of the lambing period.