Table 9.

Linear regression relationships between source animal/head characteristics and tissue thicknesses for cadaver heads from boars <200 kg BW assigned to three penetrating captive bolt (PCB) placements¹

PCB Placement	Variables (X;Y)	R 2	P-Value
FRONTAL
	Body weight, kg; soft tissue thickness, mm	0.0115	0.8009
	Body weight, kg; cranial thickness, mm	0.0575	0.5674
	Body weight, kg; total tissue thickness, mm	0.0929	0.4629
	Head weight, kg; soft tissue thickness, mm	0.1767	0.2997
	Distance between optic orbits, cm; soft tissue thickness, mm	0.2692	0.1876
	Snout to poll distance, cm; soft tissue thickness, mm	0.2608	0.1959
	Snout to poll distance, cm; cranial thickness, mm	0.1660	0.3163
	Snout to poll distance, cm; total tissue thickness, mm	0.0772	0.5053
	Maximum deflection distance, cm; soft tissue thickness, mm	0.1532	0.3377
TEMPORAL
	Body weight, kg; soft tissue thickness, mm	0.0503	0.5935
	Body weight, kg; cranial thickness, mm	0.4175	0.0835
	Body weight, kg; total tissue thickness, mm	0.1053	0.4328
	Head weight, kg; cranial thickness, mm	0.0121	0.7957
	Distance between optic orbits, cm; cranial thickness, mm	0.0229	0.7204
	Snout to poll distance, cm; cranial thickness, mm	0.2688	0.1880
	Snout to poll distance, cm; total tissue thickness, mm	0.0984	0.4492
	Maximum deflection distance, cm; cranial thickness, mm	0.0004	0.9646
BEHIND EAR
	Body weight, kg; soft tissue thickness, mm	0.0321	0.5979
	Body weight, kg; cranial thickness, mm	0.0002	0.9685
	Body weight, kg; total tissue thickness, mm	0.0376	0.5676
	Head weight, kg; soft tissue thickness, mm	0.0229	0.6566
	Head weight, kg; cranial thickness, mm	0.2605	0.1087
	Head weight, kg; total tissue thickness, mm	0.0187	0.6886
	Distance between optic orbits, cm; soft tissue thickness, mm	0.0568	0.4804
	Distance between optic orbits, cm; cranial thickness, mm	0.0151	0.7193
	Distance between optic orbits, cm; total tissue thickness, mm	0.0379	0.5661
	Snout to poll distance, cm; soft tissue thickness, mm	0.1170	0.3031
	Snout to poll distance, cm; total tissue thickness, mm	0.0000	0.9955
	Maximum deflection distance, cm; soft tissue thickness, mm	0.0111	0.7575
	Maximum deflection distance, cm; cranial thickness, mm	0.0000	0.9924
	Maximum deflection distance, cm; total tissue thickness, mm	0.0146	0.7232

¹Placements: FRONTAL—Medial bolt entry approximately 3.5 cm superior to the optic orbits at midline perpendicular with the external surface of the head; TEMPORAL—Bolt entry at the depression located between the right eye and right ear; BEHIND EAR—Bolt entry directly caudal to the pinna of the ear on the same plane as the eyes and targeting the middle of the opposite eye.

BW, body weight.