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Relative availability to laying hens of indicator PCBs present in contaminated soil. Biodisponibilité relative des PCB indicateurs présents dans un sol chez la poule pondeuse
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Edité par CCSD ; ITAVI - Institut Technique de l'Aviculture -
National audience. Transfer of indicator polychlorobiphenyls (I-PCBs) from soil into hen eggs may occur in hens reared outdoor which ingest significant amounts of soil. This transfer depends on the bioavailability of the ingested compounds The impact of soil on the bioavailability of I-PCBs was assessed by comparing their deposition in egg yolk and in abdominal fat in response to the ingestion of graded levels of I-PCBs from contaminated-soil and I-PCBs from spiked-oil. A sandy soil was collected in the vicinity of a former fire involving treated wood and was analysed to contain 709 ng I-PCBs/g DM. Twenty-eight laying hens aged 25 weeks were individually housed and fed one of the seven experimental diets during 14 days (4 replicates per diet). The seven experimental diets were a control diet without contaminant, three diets in which contaminated soil was introduced at levels of 3, 6 and 9% and three diets in which spiked oil was introduced to achieve similar levels and profile of contaminants Egg yolk and abdominal fat were collected at the end of exposure. I-PCBs were extracted by ASE (Accelerated Solvent Extraction system) and analyzed by GC-HMRS. Concentration of I-PCB in egg yolk and in abdominal fat linearly increased with the amount of I-PCB ingested (P<0.001), while soil and oil could not be differentiated (P>0.1). Soil in the current study did not modulate I-PCB bioavailability.
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