Factors affecting excretory behavior of pigs.

A 2(4) factorial experiment with six pens per treatment was conducted to examine the factors affecting the excretory behavior of growing-finishing pigs. The factors investigated were partition type (open or closed), pig density (9 or 14 pigs/pen, size: 2 m x 4.5 m), position of nipple drinker in the pen (back wall of the pen or side in front of slatted area), and prior experience of pigs (training or no training). A total of 1,104 pigs at a weight interval of 28.4 +/- .2 to 91.4 +/- .4 kg were used in this study. Pen cleanliness was assessed by a dung scoring system, and growth rate was determined over the growing-finishing period. Partition type, nipple drinker position, or prior training of pigs had no effect on growth rate. Stocking pigs at 14 pigs/pen reduced growth rate (P < .05) compared with 9 pigs/pen (.80 vs .83 kg/d). Significant differences for pen dirtiness were found for partition type. Pens with closed partitions were cleaner than those with open partitions (P = .0001) and pens became significantly dirtier as pigs grew older or heavier (P < .01). There was a significant interaction effect between pen partition and pig density as well as an interaction among pen partition, pig density, and water position (P < .05).