Arabkhazaeli F, Nabian S, Modirsaneii M, Mansoori B, Rahbari S
Department of Parasitology, Faculty of Veterinary Medicine, University of Tehran, Iran.
Iran J Parasitol. 2011 Dec;6(4):23-32.
Coccidiosis of domestic fowl, caused by species of the Genus Eimeria, is responsible for important economic losses in poultry production. Because different species and/or strains can vary in pathogenicity and other biological parameters, their precise characterization is important for epizootiological studies.
Fifty samples from litter, whole intestinal tract and feces were collected from poultry houses located in different provinces of Iran. One hundred twenty male day-old broiler chicks were challenged with three selected isolates. Data on weight gain, Food Conversion Ratio (FCR), food intake, lesion scoring and shedding of oocysts per gram of feces were recorded and analyzed by the Duncan's test.
In all treatments, the challenged groups had statistically significant lower weight gain than that of unchallenged control group. Isolate three caused the lowest weight gain and food intake and the worst lesion score as well as FCR. Despite originating from close geographical regions for isolates 1 and 2, the difference in biopathologic factors may be either due to different proportion of identified species or the different pathogenicity of the species present in the isolates.
The results highlight the importance of considering various species of Eimeria in designing the preventive, control and treatment strategies to prevent coccidiosis in different regions of Iran. Further characterization of each isolate would be the next step to provide a basis for coccidiosis research with well-characterized local isolates.
由艾美耳属物种引起的家禽球虫病，给家禽生产造成了重大经济损失。由于不同的物种和/或菌株在致病性和其他生物学参数上可能存在差异，因此对它们进行精确鉴定对于流行病学研究很重要。
从伊朗不同省份的家禽养殖场收集了50份垫料、整个肠道和粪便样本。用三种选定的分离株对120只1日龄雄性肉鸡进行攻毒。记录体重增加、饲料转化率（FCR）、采食量、病变评分和每克粪便中卵囊排出量的数据，并通过邓肯氏检验进行分析。
在所有处理中，攻毒组的体重增加在统计学上显著低于未攻毒的对照组。分离株3导致的体重增加和采食量最低，病变评分和饲料转化率也最差。尽管分离株1和2来自相近的地理区域，但生物病理因素的差异可能是由于已鉴定物种的比例不同，或者是分离株中存在的物种致病性不同。
结果突出了在设计预防、控制和治疗策略以预防伊朗不同地区的球虫病时考虑各种艾美耳属物种的重要性。对每个分离株进行进一步鉴定将是下一步为使用特征明确的本地分离株进行球虫病研究提供基础。
