“…Aßmann and colleagues utilised a combination of detomidine and morphine to provide sedation and analgesia in their case, the use of which is supported by other authors for standing surgery (Cillán‐García et al, 2020). Morphine was substituted for butorphanol by other authors (Jimenez‐Rihuete & O'Meara, 2022; Lean & Ahern, 2020; Russell & Maclean, 2006), but the analgesia afforded by butorphanol is short‐lived and has been shown to be inadequate for post‐castration analgesia (Love et al, 2009) and inferior to morphine in experimentally induced synovitis (Carregaro et al, 2014). Systematic review concluded that butorphanol has poor analgesic effects at doses used in clinical practice (Bowen et al, 2020).…”