Effects of Repeated Oral Administration of Lead Combined with Cadmium in Non Lactating Ewes

摘要

The aim of the study was to highlight the toxic effects after lead and lead-cadmium repeated oral exposure for nine weeks in ewes. An experiment was conducted using "OuledDjellal" ewes during two periods: before exposure where ewes are considered as controls and during exposure. Ten ewes were randomly divided in two groups of five; the lead group received lead nitrate at 2.5 mg.Pb/kg/day and the lead-cadmium group received lead nitrate at 2.5 mg.Pb/kg/day + cadmium chloride at 2 mg Cd/kg/day orally during 63 days. Both groups were tested for their blood lead levels and hematological and biochemical parameters before and after receiving the treatment. Before exposure, blood lead levels were below the detection limit of 4 mu g/l. Blood levels of lead during 9 weeks of exposure varied from 135+/-57 mu g/l to 356+/-147 mu g/l for the lead group and from 192+/-75 mu g/l to 445+/-294 mu g/l for the co-exposed group. Mean blood lead levels of lead-cadmium group were more elevated than the ones of the lead group. The transaminases (ALT, AST) are high for the Pb-Cd group during the two last weeks of exposure. The rates of hematocrit and hemoglobin decreased for the Pb-Cd group to reach a value of 28% and 8.9+/-0.6mg/100ml, respectively. The co-administration of Pb and Cd resulted in a significant reduction in zinc and copper plasma contents. (C)2016 PVJ. All rights reserved