Development and Validation of an Equine Castration Model and Rubric

Castration is one of the most common surgeries performed in equine practice. Veterinary students require deliberate practice to reach competence in surgical procedures including equine castration, but availability of patients limits students' practice opportunities. A recumbent equine castration model was created and evaluated using a validation framework consisting of content evidence (expert opinion), internal structure evidence (reliability of scores produced by the accompanying rubric), and evidence of relationship with other variables, specifically the difference in scores between experts and students. A convenience sample of third-year students who had never performed equine castration (n = 24) and veterinarians who had performed equine castration (n = 25) performed surgery on the model while being video recorded. Participants completed a post-operative survey about the model. All veterinarians (100%) agreed or strongly agreed that the model was suitable for teaching students the steps to perform equine castration and for assessing students' skill. The checklist produced scores with good internal consistency (α = 0.805). Veterinarians performed the castration faster than the students (p = .036) and achieved a higher total global rating score (p = .003). There was no significant difference between groups in total checklist score or individual checklist items, except veterinarians were more likely to check both sides for bleeding (p = .038). The equine castration model and rubric validated in this study can be used in a low-stress clinical skills environment to improve students' skills to perform what is otherwise a challenging field procedure. Model use should be followed with live animal practice to complete the learning process.