The effect of probiotics and acidifying preparations on Campylobacter colonization of the alimentary tract of chickens for slaughter has been presented. The following preparations were given to one-day-old chickens: All-Lac, Acid Pack-4 Way, Cerbiogalli, Biogen Dp, Toyocerin, Humokarbowit and Formic Stabil 49 in doses recommended by producers. An aqueous solution of lactic acid was administered to chicks aged from 2 to 5 days and then repeated at the age of 12-15 days. A liquid culture of Cympylobacter jejuni (Lior 6, density = 100 000 cfu per one ml at 0.5 ml per animal) was administered orally. Bacteriological examination of faeces swabs and of the liver, and the contents of small intestine and caecum made it possible to determine the degree of colonization of the alimentary tract by Campylobacter jejuni. During the experiment morphological changes in organs were monitored and body weight gains were recorded. The findings showed a total elimination of Campylobacter sp. in the digestive tract of the chickens receiving All-Lac, Cerbiogalli and Biogen Dp. The efficacy of Acid Pack-4 Way and Toyocerin on day 14 after their administration was 83.3% and 75%, and 87.5% and 75% on day 21, respectively. In birds receiving Humokarbovit, Formic Stabil 49 and lactid acid, the degree of C. jejuni isolation was always high irrespective of the day of examination. The presence of C. jejuni in the livers of injected chickens was found only in the groups receiving lactid acid and Humokarbowit (33.3% and 16.7%, respectively; in control groups - 66.6%). Significant morphological changes were noticed in the caecum of the birds without administration of any feed supplements.
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