Coccidiosis in chickens is one of the more common and widespread diseases. Since the beginning of the industrial production of broilers, veterinarians and farmers have been trying to control this costly parasite.
The annual cost is believed to be around $1.5 billion/year. The cost of coccidiosis in chickens is based on direct production losses and indirect costs through the application of control measures.
In the past, the fight against the different Eimeria species was through the use of several molecules in the food. The first chemicals used against coccidiosis in chickens were introduced in the 1950’s. It soon became clear that there were some efficacy problems with these molecules, in the sense that the Eimeria spp. present on the farms could develop resistance against them after they were used consecutively a couple of times on the same farm.