China Animal Husbandry and Veterinary Medicine ›› 2019, Vol. 46 ›› Issue (10): 3058-3064.doi: 10.16431/j.cnki.1671-7236.2019.10.028

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Analysis of Pathogenicity Difference Between Tibetan Chickens and Recessive White Chickens Following Eimeria tenella Infection

LI Jianmei, LIU Mei, SHEN Xinyue, DAI Yabin, YU Yan   

  1. Poultry Institute, Chinese Academy of Agricultural Sciences, Yangzhou 225125, China
  • Received:2019-05-14 Online:2019-10-20 Published:2019-10-21

Abstract: In order to further clarify the pathogenicity of Eimeria tenella in chickens with different susceptibility to coccidia,we infected Tibetan chickens and Recessive White chickens with resistance to coccidia at the dosage of 1×105 sporulated oocysts of Eimeria tenella.After inoculation,the clinical characteristics,blood stool score,mortality and susceptibility to coccidia were observed and recorded.Weight gain,cecum lesion score and oocyst yield were recorded.Five chickens were randomly selected from each breed before infection and 3,6 and 8 days after infection to collect anticoagulant.The number of CD4+,CD8+ T lymphocyte subsets in peripheral blood was detected by flow cytometry (FCAS).The results showed that the relative weight gain rate of Tibetan chickens infected with Eimeria tenella was higher than that of Recessive White chickens.The mortality rate,blood stool score and cecum lesion score of Tibetan chickens were lower than those of Recessive White chickens,but the oocyst yield was higher than that of Recessive White chickens.Before infection,the number of CD4+ T lymphocyte and the ratio of CD4+/CD8+ in Tibetan chickens were higher than those in Recessive White chickens.On the 3rd day after infection,the number of CD4+,CD8+ T lymphocyte and CD4+/CD8+ ratio in Tibetan chickens decreased,while the number of CD8+ T lymphocyte in Recessive White chickens decreased slightly,the number of CD4+ T lymphocyte and the ratio of CD4+/CD8+ increased,but the ratio of CD4+/CD8+ was still significantly lower than that in Tibetan chickens (P<0.05).On the 6th day after infection,the number of CD4+ T lymphocyte and the ratio of CD4+/CD8+ decreased in both breeds,Tibetan chickens showed a significant decrease (P<0.05),while only the ratio of CD4+/CD8+ in Recessive White chickens significantly decreased (P<0.05),the number of CD8+ T lymphocyte in Recessine White chickens significantly increased (P<0.05).On the 8th day after infection,the ratio of CD4+/CD8+ in two breeds of chickens significantly decreased (P<0.05).The number of CD8+ T lymphocyte in Tibetan chickens was significantly higher than that in Recessive White chickens (P<0.05),but the ratio of CD4+/CD8+ was significantly lower than that in Recessive White chickens (P<0.05).The results indicated that the pathogenicity of coccidia to Tibetan chickens and Recessive White chickens was different,which was closely related to the immune response mediated by T lymphocyte.

Key words: Tibetan chickens; Recessive White chickens; Eimeria tenella; pathogenicity; T lymphocyte subpopulations

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