Fig. 2

Observed mean activity level, respiration rate and body temperatures before and after farrowing. Legend: Observed mean activity level (left axis, orange line), respiratory rate (right axis, black line), and body temperature (left axis) measured by using rectal thermometer (RT, green line), infrared camera (IRC, red, dotted line) and infrared laser thermometer (IRT, red line) from 48 h before to 24 h after farrowing in 91 either loose housed (Farm 1 and 2) or crated (Farm 3) sows in three Norwegian piglet producing farms. Time point zero denotes the birth of the first piglet. Activity level was recorded as 1: lying down, 2: sitting, 3: standing, or 4: rooting or nest building behaviour. Respiratory rate was recorded as the number of flank movements per minute