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Cattle deaths

lyledunn
Some 10 prize bullocks died in quick succession whilst housed over winter in a cattle shed. The government vet was unable to reach a conclusion on cause but apparently does not discount electric shock as an indirect cause. 

The shed comprises steel columns and trusses with corrugated iron sheeting over. The floor comprises re-Inforced concrete slats over the slurry tank. The pens have steel barriers supported by steel posts all of which are heavily corroded but still making contact with other albeit fortuitously.

The earthing system is TT with the shed steelwork on its own providing a substantially low impedance of 5 ohms using a loop tester. A 100mA RCD protects the rather ropey lighting circuits.defccf32df3c757507a0db6ad0a35f87-huge-a5af3537-8eae-4a3c-9126-68fa60b61ac7.jpg

whilst the floor could be wet, I can’t conceive how a voltage difference could be established even if the steelwork was at 230v

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    mapj1:
    The same workers measured electrical resistance of dairy cows and determined an average value 390 ohms. Based on this work, it would appear that dairy cattle can "sense" currents of 1.0 to 6.0 ma AC and demonstrate a mild avoidance reaction at these levels. Using a 390 ohms resistance value, this translates to a threshold sensitivity of 0.4 to 2.4 volts.




    That's getting closer to my question as to how much electricity does it take to fell an ox.


    390 Ω is a good bit less than a person (even without wellies) which isn't surprising given the greater CSA, so it appears that they are more sensitive to electricity than we are.

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    mapj1:
    The same workers measured electrical resistance of dairy cows and determined an average value 390 ohms. Based on this work, it would appear that dairy cattle can "sense" currents of 1.0 to 6.0 ma AC and demonstrate a mild avoidance reaction at these levels. Using a 390 ohms resistance value, this translates to a threshold sensitivity of 0.4 to 2.4 volts.




    That's getting closer to my question as to how much electricity does it take to fell an ox.


    390 Ω is a good bit less than a person (even without wellies) which isn't surprising given the greater CSA, so it appears that they are more sensitive to electricity than we are.

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