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.
