Control Of Coccidiosis In Industrial Chicken Farms

The control of coccidiosis, consisting of vaccination and chemotherapeutics, was employed in industrial chicken farms. The present study involves in ;1.Some selected anticoccidials and levamisole which served as a immunoenhancer were combined according to their action modes, experimental purposes and used levels and medicated to chickens to evaluate their synergistic efficacy of combination among former drugs against E. tenella on the basis of criteria of weight gain and lesion scores in tested chickens. Results showed that the combinations between ployether ionophrous antibiotics and synthetic anticoccidials which acted later in the life cycle of E. tenella had the synerstic anticoccidial efficacy against coccidiosis and the good promotion of weight gain in chickens and greatly reduced single level of former drugs. In addition, the synergism of combinations for anticoccidials was related to their action modes, the time of peak activity and used levels.2.The various ratio of combinations between the mixtures of Chinese herb medicine and synthetic anticoccidials had the synerstic anticoccidial efficacy and minimized individual level of former anticoccidials and the result had given its novel approach for the comprehensive treatment of coccidiosis in chicken farms.3.Anticoccidial index (ACI) reduction of lesion scores (RLS) .percent of optimum anticoccidial activity (POAA) and ratio of oocyst production (ROP) were used as the global resistance index for measuring the resistance of E. tenella to 5 anticoccidials medicated to chickens industrial chicken farms in Shanghai. Results exhibited that all former agents apart from Diclazuril had induced field resistant strains of E. tenella. Based on the fact, an alternative method of control was put on.4. Influence of various medication programs on development of immunity to coccidiosis was observed in chickens medicated some selected single anticoccidial drugs and their combinations which had different action modes and the time of peak activity. The exhibition was as follows: strongly suppressive for polyether ionophorous antibiotics when medicated alone; non suppressive for either combinations between polyether ionophorous antibiotics and synthetic drugs which acted later in the life cycle of E. tenella at lower levels or shuttle program of former drugs. From these results, some types of practical programs were provided to industrial chicken farms.5.The available planned immunization program and the immunization inspection were established by inoculating mixed attenuated coccidiosis vaccine to chickens through feed or water for three times and counting oocysts of drop from chickens in poultry farm in Shanghai.6.Both efficacy and cost for the control of coccidiosis in the field were compared carefully between planned immunization and chemotherapeuty. Results revealed:(1)The efficacy of vaccination against coccidiosis was similar to that of chemotherapeuty.(2)The price of planned immunization per bird was 0.12 yuan (RMB ) lower than that of medication control.(3) The planned immunization could minimized the remnant level of anticoccidials in the products (eggs and meat) of chickens.