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Sabato, 06 Aprile 2019

Bonelli F. et al.

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A case of septicemia in a calf: why calves' management is so important at the farm 

  • Riferimento: Large Animal Review 2018; 24: 51-57
  • Abstract: Bovine respiratory disease (BRD) represents a serious concern for veal industry, due to the impairment of profitability, animal welfare and the increasing in antibiotics utilization, which can promote resistances in both animals and humans. Preventive strategies have to be evaluated in order to improve the ability of the animals to cope against BRD and reduce antibiotic utilization. A field trial, performed in a representative commercial veal fattening farm to evaluate the effects of multivalent vaccination on veal calves’ health and performance was carried out. The study was performed starting from mid-autumn, season at high risk for BRD. 847 calves were weighed and randomly allotted into two separate barns, one group was vaccinated 7 days after arrival with quadrivalent vaccine against BRD viruses (BHV-1, BVDV, PI3, RSV) and booster dose administered 21 days later (VAC; 609 calves), while the second one was not treated (CON; 248 calves). Only Holstein Friesian male calves were monitored and calves treated for diarrhoea before being affected by DRB were excluded. Vaccination did not affect overall mortality (P=0.56) and mortality due to BRD (P=0.23), but reduced BRD morbidity (P=0.03). Vaccination improved average daily gain (P=0.009) and carcass weight (P<0.001). Vaccination delayed the peak of BRD by nearly two weeks (P<0.001) acting as a protective factor (OR 0.64; P=0.03). BRD increased mortality (P=0.02), lowered weight gain (P<0.001), carcass weight (P<0.001) and increased the proportion of discounted carcasses (P<0.001). Lung lesions and consolidations increased with BRD (P<0.001) but were unaffected by vaccination (P=0.24 and P=0.31 respectively). BRD impaired veal calves’ health, growth performance and carcass value. Vaccination reduced BRD morbidity and ameliorated daily weight gain, thus improving carcass value thanks to the higher carcass weight and the lower % of discounted carcasses. At the present experimental conditions, vaccination increased calves growth performance and reduced BRD prevalence, thus improving overall profitability. Therefore, vaccination can represent a valuable strategy to limit BRD prevalence with positive impact on animal welfare and profitability in veal industry.
  • Note: //
  • Specie: animali da reddito
  • Anno: 2018
Letto 540 volte Ultima modifica il Sabato, 06 Aprile 2019