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Abstract
The behavioural responses of groups of seven lambs were compared with control groups
after castration and tail docking by rubber rings, application of a Burdizzo clamp
in addition to a rubber ring and after surgical castration at five, 21 and 42 days.
All methods at all ages produced changes in behaviour which were interpreted as indicative
of considerable pain. The rubber ring groups showed most changes in behaviour at all
ages. The rubber ring with Burdizzo groups showed least changes and some lambs in
these groups showed much less response than others. The surgical groups showed some
behavioural responses which were different, both qualitatively and quantitatively
to those in other groups. It is concluded that indices used for recognition and assessment
of acute pain received conditional support, that modification of the rubber ring with
Burdizzo may provide the least painful method without local anaesthesia and that age
had little effect on the responses.