Abstract：
Understanding gastrointestinal parasite distribution is crucial for effective control programs in horses. This study reports the prevalence of helminth infections in horses and selected risk factors (i.e., breed, age, climate, season) by analyzing 19,276 fecal samples from the Laboratory of Veterinary Clinical Parasitology, in Curitiba, Southern Brazil. The analyses were carried out from 2008 to 2019, coming from 153 stud farms located in 60 municipalities of nine Brazilian states. The parasite prevalence was 73.3%, with 72.1% present in the adult population and 80.6% in young horses. Strongyles were present in 100% horse farms. Strongyles had a prevalence of 72.1% with a mean FEC of 453.53 (+/- 717.6). Parascaris spp. had a prevalence of 5.8% and a FEC of 17.11 (+/- 149.2). The tropical wet/monsoon climate (Am) showed the lowest FEC for strongyles and Parascaris spp. when compared to the other climates. In the logistic regression analysis, young horses exhibited 4.6 times higher odds ratio (OR) (3.9-5.5) of Parascaris spp. and 1.2 (1.1-1.4) times higher OR of strongyles egg shedding when compared to adults (P < 0.001). Summer presented a higher risk for Parascaris spp. and Strongyles eggs when compared to the other seasons (P < 0.001). Mangalarga Marchador, Criollo, and Crossbred breeds were identified with higher OR of Parascaris spp. egg shedding than Thoroughbred. The extensive prevalence of strongyles across ages, seasons, breeds, and climates alerts for the risk of clinical manifestations in equines raised on pastures designing optimal health management and parasite control strategies worldwide.
摘要：
了解胃肠道寄生虫的分布对于马的有效控制计划至关重要。这项研究报告了马蠕虫感染的患病率和选定的危险因素(即，品种,年龄,气候,季节）通过分析来自兽医临床寄生虫学实验室的19,276个粪便样本，在库里蒂巴,巴西南部。分析于2008年至2019年进行，来自巴西9个州60个城市的153个种马场。寄生虫患病率为73.3%,成年人口中占72.1％，幼马中占80.6％。在100％的马场中存在Strongyles。Strongyles的患病率为72.1％，平均FEC为453.53（/-717.6）。Parascarisspp.患病率为5.8%，FEC为17.11(+/-149.2)。热带潮湿/季风气候（Am）显示出最低的强样式和ParascarissppFEC。与其他气候相比。在逻辑回归分析中，幼马的赔率比（OR）（3.9-5.5）高4.6倍。与成年人相比，强壮种卵脱落的OR高出1.2（1.1-1.4）倍（P<0.001）。夏季对Parascaris属物种的风险较高。与其他季节相比（P<0.001）。MangalargaMarchador,Criollo,和杂交品种被鉴定为具有较高OR的Parascarisspp。卵脱落比纯种。不同年龄的强风广泛流行，季节,品种,和气候警报在牧场上饲养的马科动物的临床表现风险，在全球范围内设计最佳的健康管理和寄生虫控制策略。
