The present study was aimed to assess the influence of three lentogenic Newcastle disease virus (NDV) strains viz B1, LaSota and ‘F’ in haemagglutination inhibition (HI) test. One hundred number day-old Babcock male chicks were divided into four groups of 25 chicks each for B1, LaSota and ‘F’ strains and unvaccinated control. Before vaccination, the maternal an...

Newcastle disease vaccines, hitherto in vogue are egg adapted. In order to overcome the possible drawbacks of egg adapted vaccines (especially mesogenic strain), viz., postvaccinal reactions of egg adapted Newcastle disease virus (NDV) Komarov (‘K’) strain, to the extent of even mortality in young (two-week-old) chicks, paralysis in eight-week-old chicks and dr...