[PCB concentrations in hair, blood, tissues and secretions of chronically-exposed dairy cows, fattening bulls and calves. 1. Course and relation of some polychlorinated biphenyls in hair, milk and tissues in exposed nursing cows and conventionally raised dairy cows].
20 cows contaminated chronically with PCB were kept as nurse cows or in a tie-stall. The contamination in different substrates (hair, milk, blood, feces) was examined for a period up to 8 months. The distribution of PCB in the carcass of some animals was registered in addition. The system of keeping nurse cows turned out to be useful in order to overcome a contamination situation. Drying off gravid animals in the first step helps solving problems of handling contaminated milk. With low contaminated animals a short dry off period is sufficient, so that the milk--after calving--is marketable (report II, in preparation). In case of nurse cows with two calves post partum a continuous decline of PCB-concentrations in the milk can be observed. With biological half life periods of 2-4 months, milk with PCB 153-concentrations of 0.15-0.20 mg/kg fat will be marketable within this period. Cows milked by milking-machines show a decline of PCB in the milk similar to nurse cows. Two animals had a limited increase p.p., probably caused by mobilization of fat in the high lactation stage. Over longer periods, the biological half-life-periods were comparable to nursing cows. Hair is easy to sample and store; it is useful as a diagnostic substrate beside the milk in order to estimate the degree of contamination in individual animals. The ratio of PCB-concentrations between perirenal fat and hair is 1:0.95 (s = +/-0.192); the ratio of PCB-concentrations between perirenal fat and milk is 1:0.77 (s = +/- 0.122).(ABSTRACT TRUNCATED AT 250 WORDS)
Klein
U
U
Institut für Tierernährung, Tierärztlichen Hochschule Hannover.
Drochner
W
W
Forschner
E
E
Johannes
B
B
D000818:Animals; D002417:Cattle / Q000378:metabolism*; D004781:Environmental Exposure; D005260:Female; D006197:Hair / Q000737:chemistry; D007774:Lactation / Q000378:metabolism*; D008892:Milk / Q000032:analysis; D011078:Polychlorinated Biphenyls / Q000493:pharmacokinetics*; D014018:Tissue Distribution
D011078:Polychlorinated Biphenyls
PCB-Konzentrationen in Haaren, Blut, Geweben und Ausscheidungen chronisch belasteter Milchkühe, Mastbullen und Kälber. 1. Mitteilung: Verlauf und Beziehung der Konzentration einiger hochchlorierter Biphenyle in Haaren, Milch und Geweben bei belasteten Ammenkühen und konventionell gehaltenen Milchrindern.