Effects of Sewage Sludge on Corn Silage and Animal Products

摘要

Studies were conducted to determine the impact of heavy metals in sludge-fertilized corn silage on the food and feed chain when the silage containing up to 5.26 mg Cd/kg was fed to dairy goats and feeder lambs. Neither health nor performance of the goats or lambs were significantly affected when the high Cd corn silage was fed continuously for approximately one half of their productive lives. Consuming approximately 5 mg Cd and 100 mg Zn/day did not cause the metals to be secreted into milk of the lactating goats. Only Zn and Cd accumulated in the animals and only in liver and kidneys.