1ESPA
Laboratory, Veterinary Department, University of Batna Algeria;
2Ecole Nationale Vétérinaire d’Alfort, UMR 955, équipe 03
Inserm, France;
*Corresponding author:lrespa@yahoo.fr
Abstract
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 dividedin 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 µg/l. Blood levels of lead during 9 weeks of exposure
varied from 135±57µg/l to 356±147µg/l for the lead group and from 192±75µg/l to
445±294µg/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.