College of Science, Health, Engineering and Education, Agricultural Sciences, Murdoch University, Murdoch, Western Australia, 6150, Australia.
College of Science, Health, Engineering and Education, Veterinary College, Murdoch University, Murdoch, Western Australia, 6150, Australia.
Aust Vet J. 2021 Mar;99(3):61-65. doi: 10.1111/avj.13038. Epub 2020 Nov 3.
Repeatable measures of pain in ruminants following husbandry procedures are required to validate responses to pain relief. This study tested the hypotheses that facial action units, activity and time spent with dam can be used to assess the efficacy of pain relief in lambs following mulesing. Merino lambs (n = 120) were allocated to one of six treatments implemented at mulesing: (1) lambs that were not mulesed or lambs that were mulesed and administered (2) no pain relief, (3) meloxicam 15 min before mulesing, (4) Tri-Solfen®, (5) a combination of meloxicam 15 min before mulesing and Tri-Solfen after mulesing and (6) meloxicam at mulesing. Facial action units detected a difference in pain between mulesed and non-mulesed lambs at 1 and 5 h post-mulesing (P = 0.005 and <0.001) but not at 26 h post-mulesing. Lambs that were not mulesed were more active and spent more time with their dams than mulesed lambs (P < 0.001). No differences were observed between lambs that were mulesed with or without pain relief. Therefore, facial action units, activity of the lamb and time spent with dam can detect pain in response to mulesing in Merino lambs but cannot detect any changes associated with pain relief.
需要可重复测量反刍动物在畜牧操作程序后的疼痛，以验证对疼痛缓解的反应。本研究检验了以下假设：面部动作单元、活动和与母羊的相处时间可用于评估去势后羔羊疼痛缓解的效果。美利奴羔羊（n = 120）被分配到以下 6 种去势处理方式之一：（1）未去势或去势并给予（2）无疼痛缓解、（3）在去势前 15 分钟给予美洛昔康、（4）Tri-Solfen®、（5）在去势前 15 分钟给予美洛昔康和去势后给予 Tri-Solfen、（6）在去势时给予美洛昔康。面部动作单元在去势后 1 和 5 小时检测到去势和未去势羔羊之间的疼痛差异（P = 0.005 和 <0.001），但在去势后 26 小时未检测到差异。未去势的羔羊比去势的羔羊更活跃，与母羊相处的时间也更长（P<0.001）。有或没有疼痛缓解的去势羔羊之间没有观察到差异。因此，面部动作单元、羔羊的活动和与母羊的相处时间可以检测到美利奴羔羊对去势的疼痛反应，但不能检测到与疼痛缓解相关的任何变化。
