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Evaluation of the cost of mastitis by Streptococcus uberis and the profitability of vaccination protocols.

S. Calsamiglia

Events

06-24-2020

Abstract:

354
Evaluation of the cost of mastitis by Streptococcus uberis and the profitability of vaccination protocols.
A. M. Mesa, S. Calsamiglia*. Animal Nutrition and Welfare Service, Univeristat Autonoma de Barcelona Bellaterra, Spain.

The objective of the research was to evaluate the cost of S. uberis mastitis and the profitability of vaccination protocols. Literature data were reviewed to determine the average incidence and effects of clinical and subclinical S. uberis mastitis and the impact of vaccination on the incidence and effects. A stochastic dairy herd simulation program (www.dairyfarm.es) was used to simulated different scenarios. The modeled farm was a 300 adult cows producing 11.500L/cow/year with an SCC of 200 � 103 cells/mL. Milk price was 0.35€/L with 0.02€/L penalty if somatic cell count were above 300 � 103/mL. The behavior of S. uberis mastitis is variable and may become chronic in some cases. However, average values of literature were used. Control scenario was tested with an average incidence of 12.5%, where 4% were clinical and 8.4% subclinical mastitis. In all cases, the incidence in primiparous cows was 25% of that of multiparous cows, culling risk was 36% and the risk of recurrence increased 35% after the first case. Clinical cases lasted 13 d where milk production was reduced 5% daily, conception rate was reduced by 26% during 42 d after the infection, and somatic cell count was multiplied by 4. Treatment cost was 30€/case including antibiotics and labor, with a recovery rate of 90%, and milk had to be withdrawn for 10 d. Subclinical cases lasted 45 d with a 7% daily reduction in milk yield and somatic cell count was multiplied by 4, but with no effects on reproduction. The vaccine (UBAC, Laboratorios Hipra SA, Spain) was applied 3x/year at 4,7€/dose including vaccine cost and labor, and reduced the incidence of clinical and subclinical diseases by 50%. In cows vaccinated but infected, the effects were reduced by 50%. All simulations were conducted for 5 years and were repeated 66 times. The cost of a case of mastitis by S. uberis was on average 88.80€. With an average incidence of 12.5%, vaccination increased the gross margin by 47€/cow/yr. The sensitivity analysis indicates that the breakeven point for the application of the vaccine is for an incidence of 3.4%.

Keywords: S. uberis mastitis cost, vaccination profitability, dairy herd economic model.