In 2 trials, pigs were weaned at 28.5 days of age, stratified by body weight and assigned to groups of 7 on the condition that no more than 2 pigs in any group were from the same litter. Each group was housed in nursery pens which contained or did not contain (control) a partition. The partition, which contained two 20x30 cm ports, was placed diagonally across the pen. Short (<10 s) and long (>=10 s) fights and the number of pigs lying down were measured by direct observation during the first 3 h and again for 1 h at 24 and 48 h after grouping. The number of scratches on each pig were counted at 25 h after grouping. Housing treatments did not affect the aggressive behaviour of the piglets. There was a significant difference in agonistic behavior between the 2 trials. Long fights were significantly correlated with ear, shoulder and total scratches. Body weight was positively correlated with the number of shoulder and total scratches. When a fight occurred, the non-combatants frequently moved to the other side of the partition, but this was variable. No pigs were seen using corners to avoid aggression. Using a partition to make weaning pens into a more complex environment did not reduce agonistic behaviour or injuries caused by agonistic behavior.
|Publication Title||Applied Animal Behaviour Science|
|Author Address||Royal Veterinary and Agricultural University, Bulowsvej 13, DK-1870 Frederiksberg C, Denmark.|
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