The Co-induced Effects Of Molybdenum And Cadmium On The Contents Of Trace Elements In Duck Tissue And Organs

The study was designed to investigate the variation of trace element content in tissues from ducks which were treated with molybdenum, cadmium or both. A total of 360 11-days-old “Jiangnan No.2” Sheldrake(half male and half female) were randomly assigned into 6 treatments(control, low-level molybdenum, high-level molybdenum, cadmium, low-level molybdenum and cadmium, high-level molybdenum and cadmium). Ducks in control group were supplied with basal diet, and others received basal diet which was supplemented with 15 mg Mo, 100 mg Mo, 4 mg Cd, 15 mg Mo+4 mg Cd, 100 mg Mo+4 mg Cd per kg, respectively. Ammonium heptamolybdate [(NH4)6Mo7O24·4H2O] and cadmium sulfate(3CdSO4·8H2O) was set as source of molybdenum and cadmium. Experimental duration was 120 days, and 10 ducks(half male and half female) were selected randomly at 30 d, 60 d,90d, 120 d to sample liver, kidney, heart, lung, large intestine, small intestine, muscular stomach, glandular stomach, trachea, esophagus, pancreas, brain, muscle, feather, skin, beak, testis, faeces, egg, and so on. The content of molybdenum, cadmium, copper, iron, zinc, selenium in tissues was determined and results were shown as below:1.Molybdenum content in tissues rised up when molybdenum was supplemented to the diet, increasing with the concentration of molybdenum, presented a dose effect; and it decreased after supplement of cadmium sulfate.2. Cadmium content in tissues boosted with supplement of cadmium to the diet, and there was significant difference between treatments and control(P<0.05 or P<0.01), moreover, the accumulating target organs of cadmium were liver and kidney.3.Copper content in tissues decreased after induced treatment combined with molybdenum and cadmium, and there was significant difference when comparing high-level molybdenum, cadmium, low-level molybdenum and cadmium, high-level molybdenum and cadmium with control(P<0.01).4. Iron content in tissues decreased after induced treatment combined with molybdenum and cadmium, which in high-level molybdenum and cadmium significantly lower than control(P<0.05).5. Zinc content in tissues decreased after induced treatment combined with molybdenum and cadmium, which in high-level molybdenum significantly lower than control(P<0.01).6. Selenium content in tissues was slightly affected by induced treatment combined with molybdenum and cadmium(P>0.05), which in cadmium, low-level molybdenum and cadmium, high-level molybdenum and cadmium significantly lower than control(P<0.05).Results showed that the content of molybdenum and cadmium increased after the inducement of molybdenum, cadmium or both; molybdenum had synergism to the uptake of cadmium; absorbtion of copper, iron, zinc, selenium was against by the inducement of molybdenum, cadmium or both, therefore it resulted in the depressed content of trace element copper, iron, zinc, selenium in tissues, and there was a synergism between molybdenum and cadmium.