国家肉羊产业技术体系 - 巴西的半干旱地区粗放饲养的绵羊艾美球虫感染的流行病学

巴西的半干旱地区粗放饲养的绵羊艾美球虫感染的流行病学

编辑：符琳琳 2016-01-06

该研究的目的是识别和确定影响巴西半干旱地区饲养的绵羊的艾美虫病的患病率。在雨季和干燥的季节收集本地绵羊的粪便样本。通过计算每克（OPG）粪便确定虫卵囊的感染程度，并利用形态计量学方法进行菌种鉴定。在所有性能评估中发现了虫卵囊，其中有68.3%的动物被感染。虫卵囊检出率受季节和动物种类影响（P＜0.05）。雨季虫卵囊检出率比旱季（80.2%vs.55.8%）要高，而与成年动物相比年幼的动物冲卵囊检出率最高（68.2%vs.39.6%）。

在干燥的季节OPG较低（1269±312 vs. 4400±1122）。研究中共发现十个菌种；其中，E. ovinoidalis，E. ovinoidalis，E. faurei，和E. crandallis是最常见的。在所有性能中发现E. ovinoidalis和 E. crandallis，他们的患病率分别为19.4%和13.6%。病原菌的高患病率表明艾美虫病在半干旱地区对于粗放饲养的动物是一个严重的威胁。

原文摘要如下：

Epidemiology of Eimeria infections in sheep raised extensively in a semiarid region of Brazil

Souza LE¹, Cruz JF², Teixeira Neto MR³, Albuquerque GR⁴, Melo AD⁵, Tapia DM⁶

Abstract：The aim of this study was to identify and determine the prevalence of Eimeria species affecting sheep raised extensively in a semiarid region of Brazil. Fecal samples of native sheep were collected during the rainy and dry seasons. The degree of infection was determined by counting oocysts per gram (OPG) of feces, and the morphometric method was used for species identification. Oocysts were found in all the properties assessed, in which 68.3% of the animals were infected. The prevalence of oocysts was influenced by the season and animal category (P<0.05). It was higher during the rainy season than the dry season (80.2% vs. 55.8%) and highest in young animals than the adults animals (68.2% vs. 39.6%). The OPG was lower during the dry season (1,269±312 vs. 4,400±1,122). Ten species were found; of these, E. ovinoidalis, E. granulosa, E. faurei, and E. crandallis were the most frequent. E. ovinoidalis and E. crandallis were found in all properties, with their prevalences being 19.4% and 13.6% respectively. The high prevalence of pathogenic species shows that eimeriosis is a risk for animals raised extensively in the semiarid region.

Keywords: Coccidiosis, morphometry, oocyts, OPG, parasitosis

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