VACCINATION TRIALS AGAINST EIMERIA TENELLA IN CHICKENS

Somia Seif Abd El-Wakeel Abou Akada,

Abstract


The aim of this study was the immunization of chickens against caecal coccidiosis through attenuation of a local field isolate of E. tenella (Behera strain 1) by gamma irradiation using three different doses (10, 15 and 20
KRad) and to compare the efficacy of this attenuated isolate with that of a commercially used vaccine, lmmucox II and a recent anticoccidial drug, Aviax which is currently used.



In this experiment, a total of 140 one day-old broiler chicks were used. They were divided into 7 groups. each group was divided into 4 replicates of
5 birds/replicate. Three groups were immunized by oral inoculation with

25000 irradiated E. tenella oocysts at dose rates of 10, 15 and 20 KRad on

5th day of age. The 4th group was immunized by the recommended dose of Immucox II at the same age and the 5th one was treated with Aviax from one day old until the end of the experiment. Groups VI and VII were kept as positive and negative control groups. This trial was performed in floor pens to simulate field conditions. All groups (except the negative control) were challenged by 105 viable sporulated oocysts of E. tenella after 4 weeks post immunization.



The criteria used for evaluation of different protocols were mortality % due to coccidiosis, body weights, body weight gains, feed conversion ratios, daily oocyst output, some haematological, histopathological and immunological changes due to coccidiosis.


Other data

Title VACCINATION TRIALS AGAINST EIMERIA TENELLA IN CHICKENS
Other Titles محاولات تحصين الدجاج ضد الأيميريا تينيللا
Authors Somia Seif Abd El-Wakeel Abou Akada
Issue Date 2000
URI http://research.asu.edu.eg/handle/12345678/38516

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