Day 020 - 28 Jul 94 - Page 11


     
     1        minutes.  You need that sort of duration in order to get a
              sensible assessment.
     2
         Q.   But you do not know whether you did that on this occasion?
     3        A.  No, I do not.
 
     4   Q.   What sort of monitoring equipment was there at Sun Valley
              poultry to test the current in the water bath?
     5        A.  On which date?
 
     6   Q.   As standard for them without you going there, so they
              could keep an eye on what current was being used?
     7        A.  Can I suggest you direct this to Mark Pattison?  I can
              give a generalisation for the industry. I do not recall
     8        what system they were using.  The usual thing is to have
              an analogue display of the current and the voltage.
     9
         Q.   On the side of the water bath?
    10        A.  On the side of the control box which supplies the
              water bath.
    11
         Q.   You do not know whether they had that or not?
    12        A.  I would be very surprised if they had not, because it
              is a standard fitting with equipment these days.
    13
         Q.   Could you say why you feel that 60 milliamps per bird was
    14        enough, was sufficient, at Sun Valley poultry?  That does
              not accord with what you normally believe, does it?
    15        A.  It does not accord with physiological responses, no,
              and also it does not accord with some of our behavioural
    16        data using the same criteria when done in a laboratory.
              No, that is a good question.
    17
              The first point I would like to make is that the frequency
    18        and waveform used here is quite different from the ones we
              up to that time had evaluated in the laboratory.
    19
         Q.   Right, and what effect would that have?
    20        A.  I cannot be certain about that.  Was it a 500 herz
              DC?  Is that what it says in the text?
    21
         Q.   Yes.
    22        A.  I could not read the text.  I cannot tell you what the
              minimum recommended current is for that particular
    23        waveform and frequency.  Nevertheless, that current, if it
              is an RMS current, it is a lot lower than the RMS
    24        equivalent for a 50 herz sinosoidal AC.  I take your
              point, I do not know why there is the discrepancy.
    25
         Q.   In the paper at tab C on page 261? 
    26        A.  Hold on, sorry.  Can I add one point to extend my last 
              answer? 
    27
         Q.   Go on.
    28        A.  In the recommendation, for instance, of 105 milliamps
              per bird, which was the basis of the Ministry's code of
    29        practice, this was the current required to provide at
              least 52 seconds worth of apparent insensibility using
    30        behavioural criteria.
 

Prev Next Index