This study used data recorded by Fitmix feeders in three different stable
groups of pregnant sows to study (a) variations in the feeder use over time, (b)
circadian variations in the feeder use, (c) the consistency of the feeder order,
and (d) the effects of dominance rank on feeder use. Sixty Large White X Landrace female pigs (Sus scrofa) from first to eighth parity were selected on a commercial farm with high health status (PRRS and Aujeszky free). It was found that the lack of protection while feeding in Fitmix made sows split their ration in several visits. On the other hand, this fact also seemed to increase efficiency by reducing nonfeeding occupation of the feeder. Optimization of the feeder efficiency took several weeks. However, a rank-related feeder order was quickly established and maintained over time. The establishment of a feeder order may ameliorate disturbances around the feeder and help stockmanship to detect
problems. Nevertheless, these conclusions should not be extrapolated to different ESF designs, larger group sizes, or dynamic groups.