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On-farm factors relating to mycotoxin occurrence and other chemical compositional traits in grass silages in Ireland

In: World Mycotoxin Journal
Authors:
C. McElhinney Teagasc Animal & Grassland Research and Innovation Centre, Grange, Dunsany, Co. Meath, Ireland.
Institute for Global Food Security, Queens University Belfast, University Road, BT71NN Belfast, United Kingdom.
Food Safety Department, Teagasc Food Research Centre, Ashtown, Dublin 15, Ireland.

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M. Danaher Food Safety Department, Teagasc Food Research Centre, Ashtown, Dublin 15, Ireland.

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C.T Elliott Institute for Global Food Security, Queens University Belfast, University Road, BT71NN Belfast, United Kingdom.

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P. O’Kiely Teagasc Animal & Grassland Research and Innovation Centre, Grange, Dunsany, Co. Meath, Ireland.

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Many pre- and post-mowing on-farm traits influence mycotoxin occurrence and conventional chemical compositionin grass silages. The objective of this study was to determine if observed on-farm pre- or post-mowing factors can be used to indicate mycotoxin occurrence or conventional chemical composition traits in grass silages. Over a two year period (2012-2013 and 2013-2014) 290 grass silages were sampled on 145 farms and these consisted of baled (n=115) and pit (n=175) silages. On each farm in each year, a questionnaire was completed and pre- and post-mowingfactors recorded. The preservation quality was better in pit compared to baled silages in both years and in silages made in Year 2 compared with Year 1. On-farm pre- and post-mowing factors were generally not secure indicators of silage conventional chemical characteristics. In contrast, the occurrence of enniatins and beauvericin generally increased with harvesting month (May-October) for grass silages. Visible mould on baled grass silages and a rottedtop layer with pit grass silages were associated with andrastin A, mycophenolic acid and roquefortine C occurrence.

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