دراسة نسجية لتأثير لقاح ميرك على لقاحي النيوكاسل و التهاب القصبات الخمجي في الدجاج البياض

Abstract EN

This study was conducted to evaluate the histopathological effect of Marek's vaccine on chicken vaccinated by Newcastle disease and infectious bronchitis vaccines .

240 chicken were used divided in eight groups , and vaccine by different route at different ages .

samples of spleen, Fabrius busra trachea and lung were taken at 7 , 14 , 21 , 28 , & 35 days for histopathology.The result indicated that there was variable change in groups , vaccinated with Newcastle disease and infectious bronchitis vaccines comparable to the negative & positive groups.