Parameter Estimated Effect§
Intercept 5.82
Time ¥ 0.13
Fall† -2.95
Summer 2.83
Farm A‡ -0.54
Time*Summer£ 0.24
Farm B*Spring€ 1.39
Farm A*Summer 1.15
§ Estimated effect on log of SPC bacteria count (log of cfu/ml) in milk
¥ Effect of each increase in 1 hr of time since pasteurization
† Effect of season (Winter is baseline season)
‡ Effect of farm (Farm C is baseline farm)
£ Interaction - Effect of each increase in 1 hr of time since pasteurization during
each season; SPC increased more with each hr since pasteurization during
Summer (Winter is baseline)
€ Interaction – effect of season on a specific farm (Farm C is baseline farm)
R2=0.71, P<0.0001
Table 1: General linear model estimated effects of significant factors on log of bacteria count (LogSPC in cfu/ml) in milk following pasteurization.