Fig. 1
From: Place conditioning as evaluation of affective valence in piglets
Place conditioning apparatus. Piglets received both treatments (castration or enrichment and sham, counterbalanced) in the side pens, differentiated by wall colour (blue or white) and tactile cues (door stoppers or drawer knobs). Middle walls could be gated to either restricting piglets to one pen during conditioning, or allowing access to all pens during pre-tests and tests. Illustration by Ann Sanderson.
