Which of the following symptoms occurs when there is deficiency of iron and copper in livestock rations?

The symptom that occurs when there is a deficiency of iron and copper in livestock rations is anemia. Anemia is a condition where the body does not have enough red blood cells or hemoglobin, which are responsible for carrying oxygen to the body's tissues. Iron and copper are essential minerals that are required for the production of hemoglobin. A deficiency of these minerals can result in anemia, which can cause reduced growth rate and weakness in livestock. Rickets is a condition caused by a deficiency of vitamin D, which can result in weakened and deformed bones. Scaly skin and lameness are not typically associated with deficiencies of iron and copper.