Abstract
After gonadectomy, more individually caged female hamsters fought prior to the initiation of hormone treatments than did group-caged females. Daily injections of testosterone propionate (TP), estradiol benzoate (EB), or progesterone (Prog) had no influence on the number of individually caged females that fought. However, TP and EB were effective in increasing the number of group-caged females that fought. In contrast to females, both individually and group-caged males fought infrequently after castration. Daily injections of TP, EB, or Prog were effective in increasing the number of individually caged males that fought, while only TP and EB were effective in group caged males. Prog failed to increase the number of group-caged hamsters of either sex that fought.
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