Information Details

Epidemic characteristics and control of avian coccidiosis

Release time:

2019-08-06

coccidia strains varies depending on the type, number and parasitic site strains, the number of infections does not reach a certain level, and the individual does not show coccidia symptoms. For moderately virulent strains, when the number of infections is too large, the number of new oocysts produced is correspondingly reduced, which is called "crowding effect". Different strains have their specific parasitic sites, and if the parasitic sites change, their pathogenicity will decrease or even disappear.

and other pathogenic relationship

tissue damage and changes in intestinal function can cause the invasion and reproduction of various harmful bacteria, and there is an interaction between E. coli and coccidia in chickens. If chickens are infected with Marek's disease virus, their immunity to coccidiosis is disturbed and coccidiosis is easy to cause coccidiosis. Infectious bursal disease can aggravate coccidiosis, and coccidiosis will greatly aggravate the harmful effect of infectious bursal disease. When coccidiosis and reovirus exist at the same time, the proportion of tarsal joint disease in chickens is greatly increased compared with reovirus alone, the mortality rate can be as high as 60%. Studies have shown that coccidia and other intestinal bacteria have a synergistic effect, and intestinal bacteria will play a role in enhancing the pathogenicity of coccidia; coccidia infection can increase the susceptibility of the body to Marek's disease and infectious bursal disease.

Current Epidemic Characteristics

The incidence rate is high. In recent years, the incidence rate of coccidiosis is getting higher and higher. The incidence rate of low-age broilers is also becoming more and more common. The earliest occurrence is 8-day-old chickens, while small intestinal coccidiosis in laying hens is also very popular in some areas.

Feed Research Institute, Chinese Academy of Agricultural Sciences

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Feed Research Institute, Chinese Academy of Agricultural Sciences

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