Evaluation of the zootechnical parameters of vaccinating against swine enzootic pneumonia under field conditions

Abstract

A field test was carried out in different production systems to evaluate the effect of vaccination against swine enzootic pneumonia with an inactivated vaccine. A total of 13,691 pigs of four different genetic origins were used, of which 7,351 were vaccinated and 6,340 were used as controls. The animals were housed in 16 fattening units, in which the 'one-site', 'two-site' and 'three-site' production systems were represented. There were the following statistically significant differences in favour of the vaccinated animals: a 1.89 per cent lower mortality (P<0.001), a 0.09 lower feed conversion ratio (P<0.030), a 3.12 per cent lower cost per kilogram gained in fattening (P<0.031), a 4.02 per cent lower cost per kilogram of carcase (P<0.018), a 3.77 per cent lower cost of feed per kilogram gained in fattening (P<0.012) and a 56.75 per cent lower potential loss of profit per kilogram gained in fattening due to mortality (P<0.001). An analysis of variance of the effects of genetic origin, treatment and production system on the different parameters showed that only the treatment had any statistically significant effect on the percentage mortality (P<0.002), feed conversion ratio (P<0.030), cost per kilogram gained in fattening (P<0.019), cost per kilogram of carcase (P<0.020), cost of feed per kilogram gained in fattening (P<0.015) and potential loss of profit per kilogram gained in fattening due to mortality (P<0.002).

Clinical Testing of Combined Vaccine Against Enzootic Pneumonia in Industrial Pig Farming in Bulgaria

“…The vaccination also contributed to the decrease in the degree and severity of the pathoanatomical lesions characteristic of EP and PCVI in the lungs of slaughtered pigs. These results are in agreement with other investigations (3,10,12,14) who report a good prophylactic effect of vaccination, despite the fact that it does not render pigs completely immune against M. hyo infection.…”

“…Although the existing vaccines do not prevent lung colonization by M. hyo, what they do provide is partial protection against pathological changes in organs (9). Vaccination has a marked positive effect: improvement of clinical signs, reduced severity of pathological lesions in the lungs, improvement in mean daily gain, shorter fattening period, and last but not least, lower mortality (3,10,12,14,15 following single-dose vaccination, the lung lesions decreased with 53% to 61% and the antibody titer against PCV2 continued to increase up to 10 weeks of age. The authors suggest that there is no immunological interference between M. hyo and PCV2 in the tested combinations and that there is little difference in the antibody titer against PCV2 between the groups given a single combined vaccine and those given the two vaccines separately.…”

Use of tylvalosin in the control of porcine enzootic pneumonia

“…The productivity parameters calculated at finishing in both groups were the percentage of mortality, average days in finishing (ADF), feed conversion ratio (FCR), average feed intake (AFI), initial weight (IW), weight at slaughter (WS), average daily weight gain (ADG), cost per kilogram gained in finishing in dollars (CKF) and cost of medicines per pig in dollars (CMP), excluding the cost of the drug tested. The productivity parameters were calculated as previously described ( Pallarés and others 2001 ). As regards mortality, postmortem examination was performed on all pigs that died during the trial period in order to determine the cause of death and evaluate the mortality.…”

Effectiveness of treatment with lincomycin hydrochloride and/or vaccination against Mycoplasma hyopneumoniae for controlling chronic respiratory disease in a herd of pigs

“…It was expected that the combined programme would have at least similar or even better effects than the two single control strategies. An early vaccination scheme was adopted because many field trials in different countries have demonstrated its effectiveness in different types of pig herds infected with M hyopneumoniae (Schatzmann and others 1996, Maes and others 1998, 1999, Pallarés and others 2001) and because it is a very common practice in Belgium. The pigs were medicated during the growing period (day 71 to day 98) because experience had shown that the respiratory problems in this herd started and were most severe during that period, and because respiratory problems are common in pigs aged 10 to 14 weeks in closed herds or in closed production systems (Christensen and others 1999, Stärk 2000, Leon and others 2001, Mateusen and others 2002).…”

“…Commercial M hyopneumoniae vaccines are often used to control the infection and related respiratory disease in pigs, and compared with treatment with antibiotics, vaccination has the advantage that there is no risk either of antimicrobial residues in the meat or of the development of antibiotic resistance by the organism. Several field studies have shown that vaccination can successfully control the economic losses due to the respiratory disease (Maes and others 1999, Bouwkamp and others 2000), and its main beneficial effects are improvements in the daily weight gain and feed conversion rate of nursery‐finishing pigs, less coughing and less use of antibiotics, and fewer lung lesions at slaughter (Maes and others 1998, 1999, Van Nes and others 2000, Pallarés and others 2001).…”