Fig. 3. Piglet left zygomatic arch, showing magnitude and orientation of bone strain during feeding, based on rosette data from Tables 2, 7. Peak maximum principal strains (tension) are shown as arrows headed away from the gage sites, and peak minimum principal strains (compression) are shown as arrows headed towards the gage sites. (A) Comparison of food types in piglets. Mean peak tensile strains recorded during the ipsilateral mastication of hard and soft chow and during milk drinking are represented on the left zygomatic arch. Compressive strains were roughly equal to tensile strains and perpendicular to them. Strain magnitude tended to be higher for harder foods and to be higher for the squamosal (Sq) than for the zygomatic (Z) bone. (B) Comparison of piglet (solid arrows) and juvenile pigs (dotted arrows) for hard chow. The triangles superimposed on the tensile strain indicate one standard deviation in magnitude (height of triangle) and in orientation (angle at apex). Strain orientations tend to be more variable in piglets. In contrast to piglets, juvenile pigs have negligible compressive strain on the squamosal. Zygomatic strain orientations indicate an opposite direction of torsion in piglets vs juveniles.