Fig. 2

Derivation of day-to-day variation and the proportion of off-water days for the water disappearance data of an randomly selected pig. Dots are the observed water disappearance by day. Solid black line represents the predicted water disappearance for this pig based on a quadratic random regression model; day-to-day variation in water intake was computed as the square root of the sum of squared residuals. Red vertical lines represent the predicted interquartile range of random regression residuals within batch based on a quadratic regression model; observations that had residuals less than the predicted interquartile range were considered off-water days (red dots)