Reliability of Fear Assessment in Growing Pigs Exposed to a Novel Object Test in Commercial Conditions
Publication Type: |
Journal Article |
Year of Publication: |
2017 |
Authors: |
Antoni Dalmau, Eva Mainau, Antonio Velarde |
Publication/Journal: |
Journal of Applied Animal Welfare Science |
Publisher: |
Routledge |
Keywords: |
commercial farms, fear, novel object test, pigs, reliability |
ISBN: |
1088-8705 |
Abstract:
ABSTRACTThe objective of this study was to assess the reliability and feasibility of a novel object test assessing fear in pigs in commercial conditions. A total of 18 commercial farms were visited, and 321 pens housing 4,220 growing pigs were assessed. Three balloons were used as a novel stimulus. Measures were (a) the time it took for the first pig to contact 1 of the balloons, (b) percentage of nonhuman animals watching the balloons each for 10 s, and (c) percentage of animals touching the balloons during periods of 5 s. The time of the first pig to contact 1 of the balloons ranged from 0 s to 362 s. An effect of the farm was found (p < .0001) for contact latency, ranging from 6.8 s to 73.3 s, but little difference was found in terms of intrafarm variability. Interobserver repeatability was also high in this measure, ranging from r = .74 to r = .96. As a result, it is concluded that contact latency could be a good measure to assess fear of a novel stimulus in commercial farms.