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Fungal growth in silages of sugarbeet press pulp and maize

Published online by Cambridge University Press:  27 March 2009

M. J. R. Nout ,
H. M. Bouwmeester ,
J. Haaksma  and
H. Van Dijk
M. J. R. Nout
Affiliation:
Department of Food Science, Agricultural University, Wageningen, The Netherlands
H. M. Bouwmeester
Affiliation:
Department of Food Science, Agricultural University, Wageningen, The Netherlands
J. Haaksma
Affiliation:
Institute for Rational Sugar Production, Bergen op Zoom, The Netherlands
H. Van Dijk
Affiliation:
Ministry of Agriculture, Natural Resources and Fisheries, Lelystad, The Netherlands
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Summary

Fungal spoilage of animal feed silage occurs frequently. In spoiled silage of sugarbeet press pulp sampled in The Netherlands during the period 1986–90, 40% of the samples were infested by Penicillium roquefortii. Other fungi of health significance included Aspergillus fumigatus (8% of all samples) and Byssochlamys spp. (4 % of all samples). P. roquefortii is also the dominant spoilage mould in maize silage. However, no PR-toxin could be detected in 25 lumps of P. roquefortii-intested maize silage, although one lump contained a fluorescent substance, with an Rff-value close to that of PR-toxin. This silage sample was not mutagenic, but had a cytotoxic effect towards Salmonella typhimurium in the Ames test. All P. roquefortii-infested lumps contained fluorescent fungal metabolites which were absent in samples taken at 5 cm distance from the corresponding lumps in the silage heaps. It is recommended that lumps of fungal-infested silage are removed before feeding the silage to cattle.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 121 , Issue 3 , December 1993 , pp. 323 - 326
Copyright
Copyright © Cambridge University Press 1993

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