The ingestion of contaminated feed had a greater contribution than
soils to most of the estimated values of THg daily intake for both grazing
animals. For cows the relative contribution of feed varied between 33
and 98% (median: 77%)whereas soil contributed in 2.0 to 67% (median:
23%). For sheep the relative contribution of soil for estimated THg daily
intakeswas slightly larger (from3.0 to 77%,with amedian value of 33%)
yet the preponderance of feed contribution remained (from 23 to 97%,
with a median value of 67%).
For OrgHg the estimated values of DI (Fig. 5B) for cows were
between 1.0 and 220 μg d−1 (median: 71 μg d−1). For sheep the
DI of OrgHg varied between 0.10 and 33 μg d−1 with a median
value of 11 μg d−1. The DI of OrgHg was between 0.020 and 3.0%
of the DI of THg for both cows and sheep. No values for ADI of