Fig. 3
Box and whisker plots of sequential energy (a) and gram weight (b) intake dogs in the second canine voluntary food intake study (Study 2) where dogs were fed the two study diets (C1 and C2), over four meals. The boxes depict median (horizontal line) and inter-quartile range (top and bottom of box), the whiskers show the 10–90% range, and outliers are shown as separate points. a A significant reduction of energy intake was observed between the first and second (P < 0.001) and the second and third (P < 0.001) meals for both diets, but there was no difference in intake between the 3rd and 4th meals (P = 1.000). A diet effect was also evident (P = 0.019), with the main difference being a lesser intake at meal two for C1 compared with C2 (P = 0.006). b A significant reduction in gram weight intake of food was observed between the first and second meals for both diets (C1: P < 0.001; C2: P = 0.009), but not between either the other meals. Further, no difference in the gram weight intake of food was observed between diets (P = 0.255)