Relative bioavailability of tropical volcanic soil-bound chlordecone in laying hens (Gallus domesticus)

Abstract

The former use of chlordecone (CLD) in the French West Indies has resulted in long-term pollution of soils and of food chains. CLD may be transferred into eggs of hens reared outdoors, through polluted soil ingestion. Tropical volcanic soils display variable capacities of pollutant retention: CLD is less available and more persistent in andosol than in nitisol. The impact of soil type on CLD bioavailability to hens was tested through a relative bioavailability study. The deposition of CLD in egg yolk and in abdominal fat was measured in 42 individually housed laying hens fed with diets containing graded levels of CLD from polluted andosol, nitisol, or spiked oil during 23 days. Within each ingested matrix, the concentration of CLD in yolk and in abdominal fat linearly increased with the amount of ingested CLD (P < 0.001). However, the response to andosol diets and to nitisol diets was not different from the response to oil diets (P > 0.1), indicating that CLD was equally bioavailable to laying hens, irrespective of the matrix. This suggests that the hen's gastrointestinal tract efficiently extracts CLD from the two tropical volcanic soils, regardless of their retention capacity. Thus, hens reared on polluted soils with CLD may lay contaminated eggs.

Effects of Standard Humic Materials on Relative Bioavailability of NDL-PCBs in Juvenile Swine

“…Comparison between oil-fed and soil-fed animals groups was realized in order to assess exposure to spiked soil with OM in terms of exposure via the alimentary one. Similar methodology was previously used [19] – [21] . The present study provides RBA estimates using a single dose comprised in a linearity-tested range of doses [17] .…”

Amendment of soil by biochars and activated carbons to reduce chlordecone bioavailability in piglets

“…Indeed involuntary soil ingestion represents a major 2 pesticide exposure pathway for outdoor reared animals (Fries et al, 1982) especially in the Antillean context (Jurjanz et al, 2017). Furthermore, it has recently been shown that CLDtransfers to animals are not limited by soil type or properties, as noticed in piglets (Bouveret et al, 2013, Delannoy et al, 2014a, lambs (Jurjanz et al, 2014), and laying hens-related studies (Fournier et al, 2012. Overall, for these domestic animal species, relative CLD bioavailability factors were not statistically different from 100% (Bouveret et al, 2013, Jurjanz et al, 2014.…”

Activated carbon, a useful medium to bind chlordecone in soil and limit its transfer to growing goat kids

“…CLD-transfer to lambs [8], piglets [9] and laying hens [10] have been proven to not be limited by the type and properties of Antillean soils (nitisol or andosol). The specific efficiency of this transfer is related to the availability of this pesticide for outdoor reared animals.…”