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Iron loading and secondary multi-trace element deficiency in a dairy herd fed silage grass grown on land fertilized with sewage sludge

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Abstract

Recycling sewage sludge by applying it to agricultural land is strategically important in the European Union and is regulated by Directive 86/278/EEC, aimed at protecting the soil and humans from the presence of unwanted substances. However, because of the ruminant feeding habits, there is a risk that animals grazed on pasture or fed crops grown on land treated in this way may ingest biosolids adhered to foliage and/or on the top soil. This paper describes an episode of toxicity in a dairy herd consuming silage from a field fertilized with sewage sludge produced in a wastewater treatment plant. The affected cows were recumbent, unable to rise and suffered diarrhoea. Analysis of tissues (fresh weight) from a cow that subsequently died revealed severe hepatic iron loading (6720 mg/kg) and secondary multi-trace element hepatic deficiency, particularly of copper (0.812 mg/kg) and manganese (0.436 mg/kg), but also selenium (0.164 mg/kg) and zinc (19.9 mg/kg). The study findings indicate that the use of sewage sludge in agriculture can cause secondary multi-trace element deficiencies in ruminants. Careful attention should be taken when crops are ensilaged avoiding top-soil sewage sludge contamination, since the acidification process may greatly increase Fe bioavailability.

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The data set supporting the results of this article are available upon request to the corresponding author.

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Acknowledgments

AHHM is grateful to Conselho Nacional de Desenvolvimento Científico e Tecnológico, CNPq, for his research productivity fellowship. The authors thank Lucia Casanova Iglesias and staff of RIAIDT for their technical assistance. The English grammar of the text was revised by Christine Francis.

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This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Correspondence to Víctor Pereira or Antonio Humberto Hamad Minervino.

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All procedures and animal handling followed the ethical principles in animal experimentation.

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The authors declare that they have no competing interests.

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Responsible editor: Philippe Garrigues

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Miranda, M., Méndez, L., Pereira, V. et al. Iron loading and secondary multi-trace element deficiency in a dairy herd fed silage grass grown on land fertilized with sewage sludge. Environ Sci Pollut Res 26, 36978–36984 (2019). https://doi.org/10.1007/s11356-019-06828-x

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  • DOI: https://doi.org/10.1007/s11356-019-06828-x

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