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Assessing pain in growing pigs using the Piglet Grimace Scale
C. Vullo, S. Barbieri, G. Catone and others
Animals (2020) 10
• What did the research find?
Surgical castration of cryptorchid pigs was completed without complications, and no pigs required postoperative rescue analgesia. However, the mean piglet grimace scale (PGS) score for the pigs increased from 1.02 before surgery to 2.16 six hours after surgery (P=0.02). This increase in PGS score correlated with a significant reduction in the pigs’ activity levels. The interobserver reliability of the PGS was excellent, with an overall interclass correlation coefficient value of 0.87.
• How was it conducted?
Ten mixed-breed cryptorchid pigs with a mean age of 73 days were filmed the day before undergoing surgical castration and six hours after surgery to evaluate their behaviour. Still frames of the face of each pig were also extracted from the videos every time they directly faced the camera. A total of six pictures of each pig’s face (three from each time point) were selected, randomly ordered and scored …
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