Occurrence and Epidemiology of Fannia Spp. (Diptera: Fanniidae) in Laying Poultry Farms in State of Minas Gerais, Brazil

ABSTRACT Aspects related to epidemiology of flies belonging to Fannia genus were studied in order to determine predisposing factors for its occurrence in layer hens houses of commercial farms in the state of Minas Gerais, Brazil. An observational, analytical and sectional survey was conducted to verify major epidemiological aspects associated to infestations. This research was accomplished starting from an adapted secondary database of and structured with information on the presence and absence of ectoparasites and arthropods, characteristics of chicken houses, the poultry, type of facilities, geographical location and the management. The study was conducted in four hundred and thirty one houses located in forty three farms visited in 2012 year in the state of Minas Gerais. Ten farms (23.25%) and sixty eight houses (15,77%) were observed the presence diptera belonging to Fannia genus. The specie Fannia admirabilis was found in four farms (9,30%), Fannia albitarsis in two farms (4,65%) and only in one farm (2.32%) was observed the presence of Fannia canicularis. For three farms 6,98% was no possible to identify the species only Fannia genus. The epidemiological aspects for the occurrence of these flies were investigated using Poisson regression models. Characteristics such as farm, city of farm, presence of Histeridae beetles, type of facility (cage, on the floor with or without bedding) and the existence of mechanical removal of manure were associated with the occurrence of Fannia spp.

【摘要】为明确巴西米纳斯吉拉斯州商业农场蛋鸡舍中厕蝇属（Fannia）蝇类滋生的易感因素，本研究针对该属蝇类的相关流行病学特征展开调研。本研究采用观察性分析横断面调查设计，旨在明确与蝇类侵染相关的核心流行病学特征。本研究基于经过适配优化的二手数据库开展，该数据库整合了体外寄生虫与节肢动物的检出情况、鸡舍特征、家禽状况、设施类型、地理位置及饲养管理模式等多维度信息。本研究于2012年对米纳斯吉拉斯州43个商业农场的431栋鸡舍进行了实地调研。结果显示，10个农场（占比23.25%）与68栋鸡舍（占比15.77%）检出厕蝇属双翅目蝇类。其中，4个农场（9.30%）检出美丽厕蝇（Fannia admirabilis），2个农场（4.65%）检出白跗厕蝇（Fannia albitarsis），仅1个农场（2.32%）检出小家厕蝇（Fannia canicularis）；另有3个农场（6.98%）仅能将样本鉴定至厕蝇属水平，无法确定具体物种。本研究采用泊松回归模型分析该类蝇类滋生的相关流行病学关联因素，结果表明农场属性、农场所在城市、阎甲科（Histeridae）甲虫的检出情况、设施类型（笼养、地面饲养（是否铺垫料））以及是否配备机械清粪系统，均与厕蝇属蝇类的滋生存在显著关联。