Toward a criterion for suspect thiouracil administration in animal husbandry
2011
Le Bizec, Bruno | Bichon, Emmanuelle | Deceuninck, Yoann | Prévost, Stéphanie | Monteau, Fabrice | Antignac, Jean-Philippe | Dervilly-Pinel, Gaud
Thyreostats are growth-promoters banned in Europe since 1981. The identification of thiouracil (TU) in animal biological matrices can, however, no longer be systematically interpreted as a consequence of illegal administration. Indeed, some experimental results have indicated a causal link between cruciferous-based diet and the presence of TU in urine of bovines. The present study aims at investigating, on a large scale (n > 1300), the natural occurrence of thiouracil in urine samples collected from different animal species. TU was identified in main breeding animal species: bovine, porcine and ovine. The natural distribution of TU allowed proposing threshold values to differentiate compliant from suspect urine samples. Suggested values are 5.7 and 9.1 µg l⁻¹ in male adult bovines (6–24 months), 3.1 and 8.1 µg l⁻¹ in female adult bovines (6–24 months), 7.3 and 17.7 µg l⁻¹ in calves (<6 months), 3.9 and 8.8 µg l⁻¹ in female bovines (>24 months), and 2.9 and 4.1 µg l⁻¹ in porcines at a 95 and 99% confidence level, respectively.
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