| Abstract: |
Three hundred and fifty four chickens (one day old) were used in this work to study the effect of addition of hydroxylamine, vitamins andminerals on the virulence and pathogenicity of NDV infection. Thechicken were divided into 4 groups (gps.) 3 experimental and onecontrol. Each group of the three experimental groups was equallysubdivided into 6 subgroups (subgps), included 108 chicks and infectedwith velogenic, mesogenic or lentogenic NDV respectively. The chickenswere fed on the basal diet (subgps 1), supplemented with hydroxylamine(subgp 2), vitamins (subgp 3), minerals (subgp 4), vitamins and minerals(subgp 5) or vitamins, minerals and hydroxylamine (subgp 6). Thecriteria, used to the evaluation of the efficiency of the vitamins, mineralsand hydroxylamine, included mortality rate, clinical signs, antibody titerand the lesions.The mortality rate in chickens infected with velogenic NOV. 90%(subgp 1 and 2), 80% (subgp 3 and 4) and 65% (subgps 5 and 6).Mesogenic NDV infected chickens showed 50% (subgps 1 and 2), 35%(subgps 3 and 4), and 20% (subgroups 5 and 6) mortalities. Theientogenic NDV infected chickens showed 5% deaths (subgps 1 and 2)and no mortalities in the remaining subgps.The chickens infected with velogenic, mesogenic and lentogenic NDV showed general signs (depression, anorexia, yellowish to green diarrhea and ruffled feathers) respiratory manifestations (sneezing, coughing, dyspnea and rals) and nervous signs (termors, forementioned signs were severe in gp (1) in comparison with gp (2).
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