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Unpublished Paper
Do Yorkshire Gilts Become Habituated to Repeated Weighing Over a Trial?
Animal Industry Report
  • Larry J. Sadler, Iowa State University
  • Anna K. Johnson, Iowa State University
  • Jennifer Young, Iowa State University
  • Steven M. Lonergan, Iowa State University
  • Jack C.M. Dekkers, Iowa State University
  • Daniel S. Nettleton, Iowa State University
Extension Number
ASL R2635
Publication Date
2011
Disciplines
Topic
Swine
Summary and Implications
The objective of this study was to determine if Yorkshire gilts become habituated to the process of weighing. A total of 192 pure bred Yorkshire gilts were used. The gilts were housed in 12 pens, 16 gilts/pen providing a space allowance of 0.82 m2/gilt. Gilts were weighed every 2-wks for a maximum of eight scores/ gilt. Gilts were scored while on the weigh scale for activity using a whole number scale of one to five (1 = calm, minimal movement; 5 = continuous rapid movement and an escape attempt) at two different time points, T = 0 (as soon as the back gate was closed and T = 15, 15 sec after the back gate was closed. Analyses were done using Proc Mixed of SAS. The differences during round one between T = 0 and T = 15 was 1 point on the 5 point scale. By round eight this had dropped down to a difference of 0.2. During the first round over both time points the gilts scored on average 2.5, by round 5 this had dropped down to around 1.5 at which point it stabilized. In conclusion, Yorkshire gilts appear to become habituated to the process of weighing over the course of a trial, and as such do not seem to find the process highly aversive.
Copyright Holder
Iowa State University
Language
en
Citation Information
Larry J. Sadler, Anna K. Johnson, Jennifer Young, Steven M. Lonergan, et al.. "Do Yorkshire Gilts Become Habituated to Repeated Weighing Over a Trial?" (2011)
Available at: http://works.bepress.com/steven_lonergan/20/