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Journal of Dairy Science Vol. 67 No. 1 224-228
© 1984 by American Dairy Science Association ®
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In Utero Exposure of Bovine Fetuses to Polychlorinated Biphenyls1

T. W. Perry2, R. J. Everson3, K. S. Hendrix2, R. C. Peterson4 and F. R. Robinson3

Purdue University Agricultural Experiment Station, West Lafayette, IN 47906

ABSTRACT

Pregnant mature beef cows more than 6 mo from parturition were fed whole plant corn silage from either a silo (contaminated) that had been coated with a plastic containing polychlorinated biphenyls (Aroclor 1254) or from a silo (clean) that had not been coated with the plastic. In addition, a third group of cows was fed silage from the clean silo plus 200 mg Aroclor 1254 per head daily (added polychlorinated biphenyls). After 30 days on treatment, one cow from each of the three treatments had her fetus removed by Caesarean section for assay of liver, thyroid, and fat for polychlorinated biphenyls content. Tissue content of polychlorinated biphenyls for fetuses from cows fed clean silage, contaminated silage, or added polychlorinated biphenyls was (µg/g): liver, 3.6, 4.7, and 54.1; thyroid, 2.3, 19.4, and 121.1; fat, .65, 18.1, and 130.6, indicating polychlorinated biphenyls cross the placenta readily. Cow milk (colostrum) contents of polychlorinated biphenyls on the 1st day following parturition for the three respective treatments were .54, 8.5, and 96.4 µg/g (clean silage, contaminated silage, and added polychlorinated biphenyls).

Fetuses taken from cows that had been removed from polychlorinated biphenyl exposure for 6 mo reflected previous treatments of dams by increased fetal fat stores of polychlorinated biphenyls.

FOOTNOTES

1 Journal Paper No. 8498, Purdue University Agricultural Experiment Station.

2 Department of Animal Sciences.

3 Department of Veterinary Sciences, Animal Disease Diagnostic Laboratory.

4 Superintendent, Lynnwood-Purdue Agricultural Center, Carmel, IN.






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Copyright © 1984 by the American Dairy Science Association ®.