Dioxin concentrations in body tissues and egg of female chicken
Nishimura, K.(National Inst. of Livestock and Grassland Science, Tsukuba, Ibaraki (Japan)) | Miyamoto, S. | Takeda, T. | Ando, M. | Tanabe, S.
To investigate the transfer and accumulation of ingested dioxins, the concentrations of polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), and coplanar-polychlorinated biphenyls (Co-PCBs) in the muscle, abdominal fat, liver, and egg of hens (Dekalb TX-35) at 1, 58, 184, and 462 days of age were measured. The levels of these three components in the four diets-starting, early growing, late growing, and laying-fed to the experimental birds were also measured. Using gas chromatography-mass spectroscopy, the concentration of each isomer of PCDD, PCDF, and Co-PCB was measured. The concentration of each component was multiplied by the individual toxic equivalency factor (TEF), the values for the isomers of each dioxin component were added together, and a toxic equivalency quantity (TEQ) was derived for each component. The total dioxin concentration (sum of TEQs for PCDDs, PCDFs, and Co-PCBs) in the muscle rose 5-fold from 58 to 462 days of age due to an increase in the amount of ether extract from muscle. These dioxin values were within the range reported for domestic chicken meat (0.0007 to 0.265 pg-TEQ/g). However concentrations in the abdominal fat and liver did not increase during the same period, suggesting that the liver is not a leading dioxin accumulation site for fowl. Dioxin concentrations in whole egg did not differ between 184 and 462 days of age and were within the reported range (0.009 to 0.138 pg-TEQ/g). This finding suggests that most of the ingested and stored dioxin did not enter the egg during the early laying period.
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