Peri-parturient changes in behavior in free-ranging domestic pigs
The behaviour of 6 Swedish Landrace gilts in enclosures of 7 and 13 ha was studied for 7 h per day during 7 days around farrowing time. A significant increase in the frequency of locomotion was recorded 2 days before farrowing. The distances walked, as measured by number of coordinates crossed per day, increased during the same period. Average distances to nearest neighbours increased significantly 1 day before farrowing. The farrowing nests, which were built on the day before farrowing or on the farrowing day, were all situated well away from the normal home range. It is suggested that the motivation for this increase in mobility, with the apparent function to isolate the nest site from the rest of the herd, is the explanation of the increse in activity frequently recorded in sows in pens during the days before farrowing. The functional significance and the practical consequences of these behaviour patterns are discussed.