A preliminary study of the production and financial impacts of clinical salmonellosis outbreaks in lactating cows in seasonal calving, pasture-based dairy herds in New Zealand, from which Salmonella enterica subsp. enterica were isolated
Abstract
ABSTRACT Aims To quantify the production effects of outbreaks of clinical salmonellosis in seasonal calving, pasture-based dairy herds in New Zealand, from which non-Brandenburg Salmonella enterica subsp. enterica were isolated, and to use these results to undertake a financial analysis of their consequences. Methods In this retrospective cohort study, we collated routinely available data for cow demographics, disease treatment, and accumulated whole of lactation milk solids (MS) yield from five spring-calving, pasture-based dairy herds that experienced naturally occurring clinical salmonellosis outbreaks in milking cows over the study period from 1 June 2021 until 31 May 2022. We used multivariable generalised linear models to estimate the effects of cow-level risk factors for clinical salmonellosis and the effects of disease on accumulated whole of lactation MS yield and risk of removal by culling or death. The financial consequences of salmonellosis were estimated with a partial budget model using the study results and publicly available information. Results The median herd incidence risk of clinical salmonellosis over the study period was 2.6% (min 0.5, max 7.0%). The adjusted marginal mean incidence risk for disease for cows of age 2, 3–4, 5–6 and ≥ 7 years of age were 0.93% (95% CI = 0.39–2.18%), 0.98% (95% CI = 0.49–1.93%), 3.5% (95% CI = 2.15–5.63%) and 4.8% (95% CI = 3.06–7.40%), respectively. In three of the four herds with milk production records, there was no…
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Evidence Hub reads this as a cohort study, done in people. Its evidence level is 3 of 5 (Moderate · trial / cohort / secondary analysis). Trials without a large randomized design, cohorts and secondary analyses give moderate evidence.
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