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Transfert des polluants organiques persistants (POP) du fourrage vers le lait chez le ruminant

Abstract : Ruminant is exposed to POPs deposited on grasslands. This thesis study the transfer of PCDD/Fs, PCBs and PAHs from fodder and soil to milk. PHE, PYR and B[a]P contaminated grass was incubated in the rumen of cows in order to determine the in sacco disappearance of PAHs, cuticular n-alkanes and DM. The 3 PAHs disappeared (83%) in the 1st hour of incubation while the cuticular n-alkanes and DM disappearance was slower. The transfer of PAHs from grass and soil towards milk has been studied in vivo in goats. The transfer to milk of native PAHs is minimal whatever the matrix ingested. The transfer of PCDD/Fs and PCBs from contaminated hay to milk has been also studied. The CORs of PCBs varied from 5% to 90% and for PCDD/Fs from 1% to 40%. The risk of human exposure via milk could become meanly with PCDD/Fs an PCBs. The current safety threshold values in milk as well as toxicity of 1-OH-PYR must be reviewed
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Submitted on : Thursday, March 29, 2018 - 2:02:40 PM
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Adrian Costera Pastor. Transfert des polluants organiques persistants (POP) du fourrage vers le lait chez le ruminant. Sciences agricoles. Institut National Polytechnique de Lorraine, 2007. Français. ⟨NNT : 2007INPL028N⟩. ⟨tel-01752948⟩



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