“…In contrast to these observations in wild rats, studies in mice exposed to acute defeat for 2, 4, 8, and 16 days showed a significant increase in plasma TSH concentrations and a continual rise in pituitary TSH levels indicating that exposure to repeated defeat may increase the synthesis, release, and storage of TSH (Eleftheriou et a1., 1968). These observations with mice coincide with previous studies in wild rabbits following capture (Eickhoff, 1949, andKracht &Kracht, 1952) who report intense overactivity of the pituitary-thyroid system coupled with autonomic instability within a few weeks after capture. Exposure of captive wild rabbits to their predators (ferrets, dogs, and man) is also a sufficient stimulus to elicit a thyrotoxic response.…”