Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 352714
Title The ultimate veal calf reference experiment: Hormone residue analysis data obtained by gas and liquid chromatography tandem mass spectrometry
Author(s) Nielen, M.W.F.; Lasaroms, J.J.P.; Essers, M.L.; Sanders, M.B.; Heskamp, H.H.; Bovee, T.F.H.; Rhijn, J.A. van; Groot, M.J.
Source Analytica Chimica Acta 586 (2007)1-2. - ISSN 0003-2670 - p. 30 - 34.
Department(s) BU Microbiological & Chemical Food Analysis
RIKILT - Business Unit Safety & Health
Publication type Refereed Article in a scientific journal
Publication year 2007
Keyword(s) yeast estrogen bioassay - confirmatory analysis - bovine urine - boldenone - steroids - cattle - calves - feces - androsta-1,4-diene-3,17-dione - 17-alpha-boldenone
Abstract A lifetime controlled reference experiment has been performed using 42 veal calves, 21 males and 21 females which were fed and housed according to European regulations and common veterinary practice. During the experiment feed, water, urine and hair were sampled and feed intake and growth were monitored. Thus for the first time residue analysis data were obtained from guaranteed lifetime-untreated animals. The analysis was focused on the natural hormones estradiol and testosterone and their metabolites, on 17 beta- and 17 alpha-nortestosterone, on 17 beta- and 17 alpha-boldenone and androsta-1,4-diene-3,17-dione (ADD), and carried out by gas chromatography tandem mass spectrometry (GC/MS/MS), an estrogen bioassay and liquid chromatography (LC) MS/MS. Feed, water and hair samples were negative for the residues tested. Female calf urines showed occasionally low levels of 17 alpha-estradiol and 17 alpha-testosterone. On one particular sampling day male veal calf urines showed very high levels of 17 alpha-testosterone (up to 1000 ng mL(-1)), accompanied by lower levels of estrone and 17 beta-testosterone. Despite these extreme levels of natural testosterone, 17 beta-boldenone was never detected in the same urine samples; even 17 alpha-boldenone and ADD were only occasionally beyond CC alpha (maximum levels 2.7 ng ng mL(-1)). The data from this unique experiment provide a set of reference values for steroid hormones in calf urine and demonstrate that 17 beta-boldenone is not a naturally occurring compound in urine samples. (c) 2006 Elsevier B.V. All rights reserved.
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