Copper Deficiency: Copper deficiency noun a lack of copper in an animals diet, sometimes caused by poisoning with molybdenum COMMENT: Symptoms of copper deficiency vary, but can include lack of growth and change of colour, where black animals turn red or grey. In severe cases, bones can fracture, particularly the shoulder blade. Diarrhoea can also occur, as well as anaemia. Copper deficiency in ewes can cause swayback in lambs. The condition is treated with injections of copper sulphate. Managing copper deficiency involves providing proper nutrition and healthcare for livestock.