Investigation Of Coccidia Species And Epidemiology Of Domestic Ducks In Fuzhou Area

Duck coccidia are protozoa of the phylum Apicomplexa, class Sporozoasida, order Eucoccidiorida, family Eimeriidae. Those belong to the genera Eimeria, Tyzzeria, Wenyonella and Isospora. Currently there are23kinds of duck coccidia recorded, with two kinds parasite in kidney while others in intestine. Duck coccidia are spread worldwide including countries such as Russia, America, England, Germany, China (20recorded species) and so on. Till2011, the duck coccidia were reported in21cities and provinces of China while none in Fuzhou area. The main purpose of this paper is to provide helpful basis for preventing and treating duck coccidia through the careful survey of duck coccidia case in Fuzhou area.Firstly, the author made a survey of6750samples of fresh duck excreta from90duck farms during the period between September2009and December2010in Fuzhou area. The result is that1237samples carried coccidia, accounting for18.3%. The highest positive rate of excreta is40.0%in Fuzhou outskirts, the lowest one is2%in Yongtai county. From this survey, the author concludes that five kinds of coccidium infecting domestic ducks in Fuzhou city are as follows:T. perniciosa (16.7%), W. philiplevinei, W. pellerdyi (3.3%, the lowest rate),I. mandari (17.8%, the highest rate), and E. battakhi.Secondly, the author finds the following three major coccidia which are harmful to ducks in many counties of Fuzhou area:T. perniciosa; W. philiplevinei; I. Mandari, through the investigation of tested67cases of duck coccidia. Among these cases, there are42cases of mixed infection (62.69%) which indicates that duck coccidia are mixed infection for the most part. The author also comes to the conclusion that this disease is mainly found among domestic ducks especially muscovy duck aging from16days to50days (82.09%), mostly from March to August. The rensults are helpful for scientific prevention and control of duck coccidia.