Fig. 5. Mean values of gastric pH (A) and motility (B) over the study period of fasting for incubating birds (1–15) and over the days after feeding for control birds (I–VII). Values in the same figure with different superscripts are significantly different (P<0.05). Values are means ± S.D. As the required conditions for applying a parametric procedure were not fulfilled, comparisons among birds were performed using a Kruskal–Wallis one-way ANOVA on ranks.