Document Detail

Effects of Fusarium toxin-contaminated wheat and feed intake level on the biotransformation and carry-over of deoxynivalenol in dairy cows.
MedLine Citation:
PMID:  16982523     Owner:  NLM     Status:  MEDLINE    
An experiment was carried out to examine the effects of feeding Fusarium toxin-contaminated wheat (8.21 mg deoxynivalenol (DON) and 0.09 mg zearalenone (ZON) per kg dry matter) at different feed intake levels on the biotransformation and carry-over of DON in dairy cows. For this purpose, 14 ruminal and duodenal fistulated dairy cows were fed a diet containing 60% concentrate with a wheat portion of 55% (Fusarium toxin-contaminated wheat (mycotoxin period) or control wheat (control period)) and the ration was completed with maize- and grass silage (50 : 50) on a dry matter basis. Daily DON intakes ranged from 16.6 to 75.6 mg in the mycotoxin period at dry matter intakes of 5.6-20.5 kg. DON was almost completely biotransformed to de-epoxy DON (94-99%) independent of the DON/feed intake, and the flow of DON and de-epoxy DON at the duodenum related to DON intake ranged from 12 to 77% when the Fusarium toxin-contaminated wheat was fed. In the serum samples, de-epoxy DON was detected in the range of 4-28 ng ml-1 in the mycotoxin period, while concentrations of DON were all below the detection limit. The daily excretion of DON and de-epoxy DON in the milk of cows fed the contaminated wheat varied between 1 and 10 microg and between 14 and 104 microg, respectively. The total carry-over rates as the ratio between the daily excretion of DON and de-epoxy DON into milk and DON intake were in the ranges of 0.0001-0.0002 and 0.0004-0.0024, respectively. Total carry-over rates of DON as DON and de-epoxy DON into the milk increased significantly with increasing milk yield. In the urine samples, de-epoxy DON was the predominant substance as compared with DON with a portion of the total DON plus de-epoxy DON concentration to 96% when the Fusarium toxin-contaminated wheat was fed, whereas the total residues of DON plus de-epoxy DON in faeces ranged between 2 and 18% of DON intake in the mycotoxin period. The degree of glucuronidation of de-epoxy DON was found to be approximately 100% in serum. From 33 to 80% of DON and from 73 to 92% of de-epoxy DON, and from 21 to 92% of DON and from 86 to 100% of de-epoxy DON were glucuronidated in the milk and urine, respectively. It is concluded that DON is very rapidly biotransformed to de-epoxy DON in the rumen and only negligible amounts of DON and de-epoxy DON were transmitted into the milk within the range of 5.6-20.5 kg day-1 dry matter intake and milk yields (fat corrected milk) between 10 and 42 kg day-1.
K Seeling; S Dänicke; H Valenta; H P Van Egmond; R C Schothorst; A A Jekel; P Lebzien; M Schollenberger; E Razzazi-Fazeli; G Flachowsky
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Food additives and contaminants     Volume:  23     ISSN:  0265-203X     ISO Abbreviation:  Food Addit Contam     Publication Date:  2006 Oct 
Date Detail:
Created Date:  2006-09-19     Completed Date:  2007-08-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8500474     Medline TA:  Food Addit Contam     Country:  England    
Other Details:
Languages:  eng     Pagination:  1008-20     Citation Subset:  IM    
Federal Agricultural Research Centre (FAL), Institute of Animal Nutrition, Bundesallee 50, Braunschweig, D-38116, Germany.
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MeSH Terms
Animal Feed / analysis*
Cattle / metabolism*
Duodenum / metabolism
Feces / chemistry
Food Analysis / methods
Food Contamination / analysis*
Milk / chemistry
Trichothecenes / administration & dosage,  analysis,  pharmacokinetics*
Triticum / chemistry*
Reg. No./Substance:
0/Trichothecenes; 51481-10-8/deoxynivalenol

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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