Graat E A, van der Kooij E, Frankena K, Henken A M, Smeets J F, Hekerman M T
Department of Animal Husbandry, Agricultural University, Wageningen, Netherlands.
Prev Vet Med. 1998 Jan;33(1-4):297-308. doi: 10.1016/s0167-5877(97)00008-1.
A study was done to find and quantify risk factors for coccidiosis. The study population consisted of 4774 broiler flocks kept on 177 farms. Flocks were considered a case when at least one bird in the flock showed microscopic presence of oocysts in intestinal scrapings in a grow-out cycle. Other flocks were defined as controls. This was done for three types of Eimeria: Eimeria acervulina, Eimeria tenella and Eimeria maxima. Logistic regression was used to assess variables that influence the occurrence of Eimeria species. There were 49 variables, based on animal, flock or farm level. There was an enhanced risk of coccidiosis due to environmental and management factors that increase the risk of introducing contamination or that are related to hygienic measures. These include lack of use of overalls by visitors, a farmyard which is difficult to clean, bad hygienic status, personnel who might also be working on other farms, presence of other animals on the farm, and feeding and drinking systems which are more difficult to clean. Also, the presence of other diseases on the farm and Eimeria species found in the previous flock increased the risk of coccidiosis.
开展了一项研究以查找并量化球虫病的风险因素。研究对象包括位于177个农场的4774个肉鸡群。在一个生长周期内，当鸡群中至少有一只鸡的肠道刮片中在显微镜下出现卵囊时，该鸡群被视为病例。其他鸡群被定义为对照。针对三种艾美耳球虫进行了此项研究：堆型艾美耳球虫、柔嫩艾美耳球虫和巨型艾美耳球虫。采用逻辑回归分析来评估影响艾美耳球虫种类发生的变量。基于动物、鸡群或农场层面，共有49个变量。由于环境和管理因素增加了引入污染的风险或与卫生措施相关，球虫病风险有所增加。这些因素包括访客未穿工作服、难以清洁的农家院、卫生状况差、可能还在其他农场工作的人员、农场中存在其他动物以及更难清洁的喂料和饮水系统。此外，农场中存在其他疾病以及前一批鸡群中发现的艾美耳球虫种类也增加了球虫病的风险。
