A note on the relationship between the behavioural response of lactating sows to humans and the survival of their piglets

The objective of this study was to examine the relationships, based on unit averages, between the behavioural responses of lactating sows to humans an d the performance of sows in 25 farrowing units at a large commercial farm. The behavioural responses of 25 sows in each farrowing unit were observed at 2-4 and 16-18 days of lactation and a correlation analysis, using unit a verages, was used to examine the behaviour-productivity relationships. Mode rate and significant between-unit correlations were found between the behav ioural response of lactating sows at days 16-18 to an approaching experimen ter and the percentage of stillborn piglets. Units in which test sows were quicker to withdraw in the presence of the experimenter had a higher stillb irth rate than those units in which a reduced withdrawal response was displ ayed. The withdrawal response of sows in the close presence of the experime nter accounted for about 18% of the variance in percentage of stillborn pig lets. While this study was a preliminary one examining the potential for th e human-animal relationship to affect the performance of sows in the farrow ing shed, the results indicate that high levels of fear of humans by sows m ay affect the survival of their piglets. The possible mechanisms whereby fe ar may affect piglet survival are considered. Clearly further research is w arranted because of the important practical implications of this negative f ear-productivity relationship on animal performance and welfare. (C) 1999 E lsevier Science B.V. All rights reserved.