Williams S, Tucker C A, Green M J, Freeman S L
School of Veterinary Medicine and Science, University of Nottingham, UK.
Equine Vet J Suppl. 2011 Aug(39):93-7. doi: 10.1111/j.2042-3306.2011.00399.x.
Management regimes have been identified as risk factors for equine intestinal motility disorders. However, it is not known how management factors affect gastrointestinal motility.
Large intestinal motility was similar in horses on a stabled and a pastured management regime.
To investigate the effect of 2 different management regimes on large intestinal motility assessed with ultrasonography.
A within-subjects crossover design was used to compare large intestinal motility between a stabled and a pastured regime in 16 working horses. Group A was managed under a standardised stabled regime throughout the study. Group B was maintained at pasture for the first monitoring phase and then transferred to the stabled regime for the second monitoring phase. Motility of the caecum, sternal flexure and aboral left ventral colon (contractions/min) was measured twice daily for 2 consecutive days using transcutaneous ultrasonography. Mean values for each management regime were pooled for analysis using multilevel statistical modelling.
Significant variables identified by the model included: time of day, region of intestine, management regime, and combination of region of intestine and management regime. Motility assessed by ultrasound was significantly lower in stabled horses compared to pasture-kept horses. Intestinal motility for caecum was 1.7 ± 0.3 contractions/min (pastured = 2.0, stabled = 1.4), sternal flexure was 1.6 ± 0.2 contractions/min (mean (pastured = 1.7, stabled = 1.5), and left ventral colon was 0.8 ± 0.3 contractions/min (pastured = 1.0, stabled = 0.7).
The null hypothesis was disproven. Large intestinal motility assessed by ultrasound was significantly reduced in stabled horses compared to pastured horses. This effect was most marked in the aboral left ventral colon.
This study has demonstrated a possible mechanism for the increased risk of large intestinal impactions in stabled horses.
管理方式已被确定为马属动物肠道运动障碍的风险因素。然而，尚不清楚管理因素如何影响胃肠动力。
在舍饲和放牧管理方式下的马匹，其大肠动力相似。
通过超声检查，研究两种不同管理方式对大肠动力的影响。
采用受试者自身交叉设计，比较16匹役用马在舍饲和放牧管理方式下的大肠动力。在整个研究过程中，A组按照标准化的舍饲方式管理。B组在第一个监测阶段维持在牧场饲养，然后在第二个监测阶段转入舍饲管理。连续两天每天使用经皮超声检查盲肠、胸骨曲和左腹结肠远心段（每分钟收缩次数）的动力。使用多水平统计模型汇总每种管理方式的平均值进行分析。
模型确定的显著变量包括：一天中的时间、肠道区域、管理方式以及肠道区域和管理方式的组合。与放牧饲养的马匹相比，舍饲马匹经超声评估的动力显著降低。盲肠的肠道动力为1.7±0.3次/分钟（放牧=2.0，舍饲=1.4），胸骨曲为1.6±0.2次/分钟（平均（放牧=1.7，舍饲=1.5），左腹结肠为0.8±0.3次/分钟（放牧=1.0，舍饲=0.7）。
原假设被推翻。与放牧马匹相比，舍饲马匹经超声评估的大肠动力显著降低。这种影响在左腹结肠远心段最为明显。
本研究揭示了舍饲马匹大肠阻塞风险增加的一种可能机制。
