The Effect of Atrophic Rhinitis on Growth Rate

Growth rate in pigs with turbinate atrophy was compared to growth rate in pigs without turbinate atrophy in 9 herds with atrophic rhinitis (AR) in which toxigenic strains of Pasteurella multocida had been isolated. Average reduction in growth rate in pigs with severe turbinate atrophy was 4.7 % as compared to pigs without turbinate atrophy. The difference was statistically significant only in some herds. Pigs with moderate AR gained on average 1.1 % less than unaffected ones. Thus, the study supports the assumption that AR is of economic significance in modern pig farming.     

The Use of Gallamycin for Controlling Infectious Atrophic Rhinitis in Bacon Pigs

The use of Gallamycin to control nasal deterioration and permit increased growth rates in bacon type pigs was studied. Litters were randomly divided according to sex into treatment and control groups. Animals were treated by injection with 2.5 mgm of Gallamycin per pound liveweight at weekly intervals commencing during the first through the fifth week of age. Treatments ceased during the eighth week of age. Gallamycin treatment did not reduce significantly the percentage of nasal turbinate degeneration nor increase the rate of gain per day of treatment compared with control animals within litters. Possible explanations of results obtained are hypothesized.     

Vaccination against Atrophic Rhinitis: Effect on Clinical Symptoms,Growth Rate and Turbinate Atrophy

Two combined Pasteurella multocida/Bordetella bronchiseptica whole cell bacterins were tested in 15 swine herds in which atrophic rhinitis (AR) was a problem, though of varying significance. One half of the sows/litters in each herd was vaccinated, the other half acting as a control group. Vaccination resulted in reduced clinical symptoms of AR and an average increase in weight gain of 2.4 % in the 8 herds in which toxigenic P. multocida had been isolated, which was not statistically significant. Clinical symptoms and turbinate atrophy were also observed in vaccinated animals in most herds. The need for improved methods to diagnose the presence of toxigenic P. multocida is discussed. Vaccination programmes in which herds are selected on the basis of the presence of toxigenic P. multocida are proposed.