In each indoor group-penning system, an attempt should be made to reduce social stress around feeding by allowing individual feed consumption by use of a feeding stall of some sort.

The only way currently available to reduce social stress among indoor group-housed sows is to provide individual feeding areas and even then behavioral problems are common.

By combination of field investigation, indoor man-feeding and the result of chemical analysis, the authors studied the influence of nicotine on peach aphids.