The investigations have been done on the farm with a moderate form of atrophic rhinitis (AR). For trials 80 sows and their litters divided randomly into 4 equal groups I, II, III and IV were used. Sows and piglets from the group I were immunized using Bordetella bronchiseptica bacterin (Bp). Femals from the group II were vaccinated with a monovalent Bp bacterin and piglets from this group apart from the vaccine were given additionally twice antiserum Bp and Pasteurella multocida (Pm). Sows and piglets of the group III were immunized with monovalent vaccines against Bp and Pm. Swine from group IV served as control. Effectiveness of the treatment was assesed by three different methods: a) body weight gains of 50 slaughter hogs from each group, b) done’s visual snout evaluation and c) digital computer evaluation of turbinate parameter ratios (TPR). The obtained results showed that each of the used methods of immunoprophylaxis was useful. The best results were noted in the group II. It was found that clinical investigations were not eftective to determine the health status of swine regarding to AR. The most objective method seems to be TPR evaluation. Direct correlation between the intensity of changes in the snout and body weight gains was proved to be only partially useful.
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