Breed differences in individual distance of domestic sheep

  • Grete Jørgensen, Norwegian University of Life Sciences, Norway
  • Inger Lise Andersen, Norway
  • Knut Bøe, Norway
  • The aim of this experiment was to investigate individual distance for two different breeds of sheep during resting and feeding. Eight groups of 4 Spæl sheep, a light, native Norwegian breed (Mean ewe weight ± STD; 56.9 ± 7.7 kg), and 8 groups of 4 Nor-X sheep, a heavy white sheep, bred for meat production (79.6 ± 5.2 kg), were used. The experimental pens were built in an insulated building with similar temperatures over test days; pens measured 2 m x 12 m. A solid wooden resting platform (0.6 m wide) was created along the 12 meter wall. After one week of acclimatisation to the experimental pens, 24 hour video recordings were performed. Both the distance between all 4 individuals (6 possible pairings) and their resting position (head against head, head against back or back against back) was scored every 15 minutes during 12 hours (6 p.m. to 6 a.m.). In addition, the distance between the ewes at the feed barrier was recorded every second minute for 2 hours after each feeding. Number of ewes feeding and resting simultaneously was also recorded. Spæl ewes kept in closer proximity to each other (Mean ± SE; 1.45 ± 0.16 m) compared to the Nor-X ewes (3.1 ± 0.16 m) (F1,68=48.5, P<0.0001). The same breed difference was found in individual distance when feeding where the Spæl sheep kept within significantly closer distance to their group mates (2.3 ± 0.07 m) than Nor-X sheep (3.1 ± 0.09 m, F1,68=10.3, P<0.005). No significant differences were found in synchrony of resting or feeding behaviour between the two breeds. More details on individual variation will be given in the presentation. In conclusion, there were clear differences in individual distance when resting between these two breeds of sheep, which might be influenced by the breeds' level of domestication.