Livestock may not reach an acceptable level of excellence for meat, milk, hides, wool, eggs and other purposes for which the animals are reared. The problem may arise through lack of agricultural education, lack of capital funds, lack of availability of methods of cross-breeding (or through the virulence of disease such as trypanosomiasis which make this impossible), overuse of breeding animals, inadequate control of disease, inadequate nutrition, or general agricultural mismanagement.