Eimeria tenella : 抗콕시듐제 投藥 中斷에 따른 닭 콕시듐증 誘發

Eimeria tenella : pattern of coccidiosis in chicken withdrawing of anticoccidial drug

In order to odbserve the pattern fo coccidiosis of 4 weeks chickens which were administrated with 0.01 % amprolium and 0.01% nitrofurazone in water as an inticocidial drug, were inoculated with 1000 eimeria tenella orally during administration of anticoccidial drug and reinoculated with it at the second day after anticoccideal drug withdrawn. And to determine the resistance against reinoculation with E.tenella, OPG, lesion score and microscopical observation of cecum in chicken were compared chronically the difference betwiin before withdrawal of anticoccidial drug with after withdrawal of anticoccideal drug to chickens inoculated with E. tenella. The results were summarized as follfws: 1. The typical coccidiosis in the nonmedicated chickens were shown up not only the destruction of epitherial cell layer and lamina propia of cecum by the procedure of developing oocysts, but also the signs of inflammation of cecum microscopically from the 7th day through the 10th day and after reinoculation.The signs of coccidiosis are almostly same. OPG in chickens inoculated with E. tenella were 4400-26090 at the 7th day through the 10th day. But after reinoculation, it was decreased to 150-5930. 2. The coccidiosis of chickens which were administrated 0.01% amprolium was not shown up, However withdrawing of anticoccidial drug, chickens were reinoculated with E. tenella, have brought the typical coccidiosis in cecum accompanied with the sloughing of epitherial cell layer and lamina propian and a great number of oocyt in faecal examinatoin(＋＋＋＋). OPG in the reinoculatoin chickens were 1520-22800 at the 7th day through the 14th day. 3. The slight pattern of coccidiosis(＋＋) was shown up in the chickens which were administrated with 0.01% nitrofurazone and also are same pattern in the reinoculated chinkens withdrawn nitrofurazone. and OPG in the chickens administrated and in the chickens withdrawn nitrofurazone are apparently less than the OPG of nonmedicated chickens and reinoculated chickens after wethdrawing amprolium.