[Antibody dynamics in growing birds experimentally infected or naturally sick with white diarrhea]

Serologic studies were carried out with growing birds, aged 37-70 days, experimentally and spontaneously infected with Salmonella gallinarum and Salmonella pullorum, respectively. More positively reacting birds were found by means of the whole-blood agglutination reaction with typhoid-pullorum test than in the study of the same birds when aged 6-7 months. The investigation of birds when young is also advantageous in that there are no losses of eggs, it is more readily carried out, and the infected flocks could as early as the first selection be intended for market production, being replaced with healthy flocks. It is believed that certain changes in the programme for the control on pedigree and reproduction flocks would be purposeful, the first investigation for pullorum disease being carried out when the birds are aged 40-70 days and not when 6-7 months old.