Summary of results of the linear mixed models showing the estimated marginal means (±se) reported as the mean response for type of calving group adjusting for potential confounding variables in the model, and significance for the outcome variables for milk production and composition parameters

Estimated marginal means (±se)P values
Outcome variablesPreterm calvingFull-term calvingType of calvingParityCalving 
Calving monthSire typeStage of lactation
Cumulative milk yield (kg)5451 (±207)5687 (±200)<0.01<0.01<0.01<0.010.08<0.01
Average milk protein (%)3.22 (±0.02)3.20 (±0.02)0.01<0.01<0.01<0.010.15<0.01
Average butter fat (%)4.03 (±0.04)4.07 (±0.04)0.020.17<0.01<0.01–*<0.01
Average somatic cell score2.12 (±0.03)2.13 (±0.03)0.94<0.01<0.010.01<0.01<0.01
  • *Sire type (P=0.81) was not included in the multivariable analysis for average butter fat.