Table-5.
Comparative assessment of the transition rates of heavy metals in the system “soil–feed–mare’s milk–manure.”
| Heavy metals | Metal content level | ||||||
|---|---|---|---|---|---|---|---|
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| In the soil of pastures | In feed, mg/kg | In milk, mL/L | In manure, mg/kg | ||||
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| Average content, mg/kg TR, % | Average content, mg/kg | TR, % | Average content, mg/l | TR, % | Average content, mg/kg | TR, % | |
| Farm No. 1 | |||||||
| Cd | 0.2869 | 0.2767 | 0.96 | 0.0086 | 0.03 | 0.1745 | 0.6 |
| Pb | 1.086 | 0.1407 | 0.12 | 0.0331 | 0.03 | 0.1246 | 0.11 |
| As | 0.0190 | 0* | - | 0 | - | 0* | - |
| Hg | 0.0163 | 0 | - | 0 | - | 0 | - |
| Farm No. 2 | |||||||
| Cd | 0.3158 | 0.2055 | 0.65 | 0.0134 | 0.06 | 0.2044 | 0.64 |
| Pb | 1.3043 | 0.7604 | 0.58 | 0.1544 | 0.2 | 0.6445 | 0.49 |
| As | 0.0198 | 0* | - | 0 | - | 0* | - |
| Hg | 0.0296 | 0* | - | 0 | - | 0* | - |
*
0=Minor traces of the element, (–)=No transition rate. Cd=Cadmium, Pb=Lead, As=Arsenic, Hg=Mercury, TR=Transition rate