Fig. 3
Coefficient plots for the association between bacterial finding (0/1) and milking system1. 1Odds ratio (95% confidence interval) for the association between cow-level bacterial finding (0/1) and milking system in logistic regression models including all observations (n = 36,286 milk samples from 4132 farms). Herd was included as random effect, and herd size and herd average milk yield was included as confounders. a Association between parlour milking (freestall) compared to tiestall pipeline b automatic milking systems (AMS) milking (freestall) compared to tiestall pipeline. Figure c and d provide the estimates for the same models on a subset of samples from farms with 30-70 cows (n = 18,119 milk samples from 1371 farms) for parlour milking compared to tiestall pipeline and AMS compared to tiestall pipeline, respectively