Tonic immobility: differences in susceptibility of experimental and normal sheep and goats.
Tonic immobility ("animal hypnosis" or catatonic trance) could not be induced in 1-year-old foster lambs and kids. Control animals, conforming to a characteristic of their species, could be readily immobilized. The suggested explanation for this difference in behavior is that the foster animals did not develop a normal flight distance because of the ambivalent behavior of the "stepmother," who alternately permitted and refused nursing.
D000818:Animals; D004198:Disease Susceptibility; D006041:Goats; D009069:Movement Disorders; D012756:Sheep; D034561:Sheep, Domestic
MOVEMENT DISORDERS/experimental