New Zealand Journal of Agricultural Research abstracts

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Short communication

Residual profile of DDT in egg yolks of laying hens following an oral application

N. FURUSAWA
Y. MORITA

Faculty of Human Life Science
Osaka City University
Osaka 558-8585, Japan

Abstract  Laying hens were treated orally with a single dose of DDT 1 mg kg^-1 (body weight). Concentrations (μg g^-1) of DDT and its metabolites, DDE and DDD, in egg yolks laid for 21 days after the DDT treatment were determined by normal-phase high-performance liquid chromatography. After the DDT treatment, DDT residues were found in the yolk on the second day while DDE was present after 2-4 days. No DDD was detected (<0.03 μg g^-1). The highest levels of DDT (mean 0.52 μg g^-1) and DDE (mean 0.11 μg g^-1) were observed on the fifth and sixth days, respectively. DDT and DDE levels then decreased slowly and were still detected to the twenty-first day. The half-lives of DDT and DDE in egg yolks were estimated to be 7.6 and 12.8 days, respectively. In the egg yolk, the decrease of the metabolite, DDE, was slower than that of DDT (P < 0.05). The present data would be useful in judging the duration of residues of the DDTs in eggs.

Keywords  DDT; DDE; single dose; laying hens; egg yolks

New Zealand Journal of Agricultural Research, 2001, Vol. 44: 297-300

0028-8233/01/4404-0297 $7.00/0 (c) The Royal Society of New Zealand 2001

PDF file of entire paper: medium quality (298K); (scanned from paper original: notes about this process)

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