Abstract
Summary o 1. Observations were made on the behaviour of 76 herd bulls on 216 occasions of semen collecting. 2. The behaviour of bulls in the Chillingham herd of Wild White Cattle was observed and one feature of their behaviour is discussed. 3. Constancy in behaviour of bulls was observed. 4. According to the behaviour observed on each visit the disposition of each bull was recorded in one of six groups A,B,C,D,E, and F. 5. The behaviour pattern of each group is briefly described. 6. Young bulls are seen to be of stable personality. 7. Adult beef bulls are shown to reveal mainly docile behaviour. 8. Adult bulls of dairy breeds are shown to have wide variation in behaviour and a great many to be neurotic. 9. Neurosis is thought to be revealed by the behaviour of all the bulls in groups D, E and F. 10. A theory on the aetiology of this neurosis is put forward and is based on the conflict of two factors—libido and threat in environment. 11. The threat display of the bull is described as occurring in aggression, being different to that demonstrated in apprehension.
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