Unexpected Cu and Zn speciation patterns in the feed-animal-excreta system

Legros Samuel, Tella Marie, Monteiro Alessandra N.T.R., Forouzandeh Asal, Penen Florent, Durosoy Stéphane, Doelsch Emmanuel. 2023. Unexpected Cu and Zn speciation patterns in the feed-animal-excreta system. In : Book of Abstracts of the 74th Annual Meeting of the European Federation of Animal Science. EAAP. Wageningen : Wageningen Academic Publishers, Résumé, p. 712. (EAAP Book of Abstracts, 29) ISBN 978-90-8686-384-6 Annual Meeting of the European Federation of Animal Science (EAAP). 74, Lyon, France, 26 Août 2023/1 Septembre 2023.

Résumé : Trace minerals such as copper (Cu) and zinc (Zn) are animal nutrition supplements necessary for livestock health and breeding performance, yet they also have environmental impacts via animal excretion. Here we investigated changes in Cu and Zn speciation from the feed additive to the animal excreta stages. The aim of this study was to assess whether different Cu and Zn feed additives induce different Cu and Zn speciation patterns, and to determine the extent to which this speciation is preserved throughout the feed-animal-excreta system. Two types of animals were considered, broilers and pigs. Synchrotron-based X-ray absorption spectro copy (XA) was used for this investigation. The principal findings were: ( I) In feed, Cu and Zn speciation changed rapidly from the feed additive signature (Cu and Zn oxides or Cu and Zn sulphates) to Cu and Zn organic complexes (Cu phytate and Zn phytate). (2) In the digestive tract, the results depend on the animal studied. In bro il ers, we showed that Cu and Zn phytate were major Cu and Zn pecies while Cu sulphide and Zn amorphous phosphate species were detected but remained minor species. In pigs, we showed that the Cu and Zn dominant species were Zn phytate and Cu sulphide. (3) In fresh excreta, the results depend on the element studied. For Cu, Cu sulphide is always the major species regardless of the animal studied. For Zn, Zn amorphous phosphate is the major species for broilers while Zn sulphide is the major species for pigs. These results should help to: ( I) enhance the design of future research studies comparing different feed additive performance ; (2) asess Cu and Zn bioavailability in the digestive tract; (3) gain further insight into the fa te of Cu and Zn in cultivated soils when poultry manure is used as fertilizer.

Auteurs et affiliations

• Legros Samuel, CIRAD-PERSYST-UPR Recyclage et risque (REU)
• Tella Marie, CIRAD-PERSYST-US Analyses (FRA)
• Monteiro Alessandra N.T.R., Animine (FRA)
• Forouzandeh Asal, Universitat Autonoma de Barcelona (ESP)
• Penen Florent, Animine (FRA)
• Durosoy Stéphane, Animine (FRA)
• Doelsch Emmanuel, CIRAD-PERSYST-UPR Recyclage et risque (FRA) ORCID: 0000-0002-7478-4296

Source : Cirad-Agritrop (https://agritrop.cirad.fr/609344/)

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