Overall pen size may restrict normal sow behaviour associated with settling the pecking order. Ideally the group should have been established before animals are introduced into this system. In any loose housed system it is preferable to house gilts prior to first parturition separately. Cost Relatively expensive Level of Aggression Full protection at feeding Limited space for mixing small groups. Poor feeder access can be a problem Reliability Simple and reliable.
Sows are accessible in the feed stall for procedures such as pregnancy diagnosis.
If sows drop out of a group it is difficult to utilise that housing space. Labour Simple to manage Predominantly a manual system.