Most often it occurs in animals whose offspring have died, so it may be attributable to insufficient milking. Köhler-Rollefson, Musa and Fadl Achmed, 1991). Among the most common diseases affecting livestock are trypanosomiasis (ghuffar), mange (jerab), pneumonia (haboob), camel pox (ghedderi), contagious skin necrosis (na'aita) and ringworm (ghoob) and Western medication is rarely available to treat them.