Three sequential studies were performed to evaluate the effects of tying horses while wearing overchecks (strap from the bridle to backpad). In an observational study, horses (n = 305) wore high (HC), low (LC), or no overchecks (NC) with frequencies of 29.2%, 51.8% and 19.0% respectively. Study 1 (Latin square, n = 6) consisted of a 90-min tie test (90TT) with treatments (HC, LC, NC) x periods (1-3). Horses wearing HC had higher plasma cortisol (P < 0.01) when compared to LC and NC. Muscle soreness (MSS) and tightness (MTS) were evaluated pre and 24 hr post 90TT and were higher (P < 0.01) 24 hrs after 90TT regardless of treatment. In study 2, in order to determine if acclimation to tying with overchecks could reduce the cortisol response in study 1, horses (n = 6) were tied 60 minutes/day for 2 weeks followed by a 60-min TT (60TT). Neither plasma cortisol nor heart rate were elevated above baseline levels, suggesting adaptation to novel stressors. Tying with restrictive HC appears to be a stressor, which may be reduced if an adaptation period is provided.

中文翻译：

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过度检查对驾驶马的压力参数和福利影响的影响。

进行了三个顺序的研究，以评估穿着过多检查（从马笼头到背板的绑带）时绑马的效果。在一项观察性研究中，马（n = 305）穿高（HC），低（LC）或没有超额检查（NC）的频率分别为29.2％，51.8％和19.0％。研究1（拉丁方，n = 6）由90分钟的领带测试（90TT）和治疗（HC，LC，NC）x周期（1-3）组成。与LC和NC相比，戴着HC的马的血浆皮质醇更高（P <0.01）。在90TT之前和之后24小时评估肌肉酸痛（MSS）和紧密度（MTS），无论治疗如何，均在90TT后24小时更高（P <0.01）。在研究2中，为了确定适应过度检查是否会降低研究1中的皮质醇反应，将马（n = 6）每天捆绑60分钟，持续2周，然后进行60分钟的TT（60TT）。血浆皮质醇和心率均未升高至基线水平以上，表明适应新的应激源。与限制性HC捆绑似乎是一个压力源，如果提供了适应期，可能会减少。