2 groups of 15 and 12 cows resp. were maintained under identical conditions of management. The 2 most dominant cows from the 1st group were transferred to the 2nd group then returned 2 wk later. After a further 4 wk, the 2 most subordinate cows from the 1st group were transferred to the 2nd group and returned 2 wk later. On both occasions the transferred animals were lactating. Establishment of new cows within the hierarchy was completed within 24 h, and involved a doubling of aggressive activity, which was more prolonged on the latter occasion, but the increase in aggression had no effect on milk yield. Results suggest that any decrease in milk yield following the movement of cows between groups is likely to be due to associated changes in factors such as diet or housing.
|Publication Title||Applied Animal Ethology|
|Author Address||Inst. for Res. on Anim. Diseases, Compton, Newbury, Berks. RG16 0NN, UK.|
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