The pitch is usually between 2 and 3 kHz. Barks appear to be both threat and alarm calls, having a high arousal effect on other pigs, particularly preweaned young. Other animals react to barking with quick orientation, followed by a brief period of immobility and silence. Definition from Hurnik et al., 1995. A rare respiratory disease of pigs.
Behavioral symptoms are difficult breathing, repeated barking sounds, and uncoordinated locomotion.
Definition from Hurnik et al., 1995. An environment of very low complexity. Definition from Hurnik et al., 1995. Definition from Hurnik et al., 1995. Battery cages usually are stacked in several horizontal tiers and most commonly are used for housing of laying hens.