On the heredity of testosterone and readiness to attack

Article Abstract:

Differences among two wild house mouse male types with respect to attack latency have led scientists to hypothesize the possible influence of the Y chromosome in the development of aggressive behavior. Crossings experiments using mice characterized by long and short atack latencies were performed to produce four different progeny groups. Males were then tested for attack latencies upon reaching 14 weeks of age. Adult circulating testosterone (T) levels were also measured from both parent and progeny blood samples. Results indicating the absence of a Y-chromosome influence on T suggests that its effect is mediated by perinatal processes.

Genetic aspects, Y chromosome

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Differential testosterone secretory capacity of the testes of aggressive and nonaggressive house mice during ontogeny

Article Abstract:

The testosterone secretory capacity of testicular Leydig cells during ontogeny was tested for male house mice characterized by long attack latency and short attack latency. The tests were performed on rats in the neonatal, prepubertal and adult stages. Results indicate that differential changes in the secretory capacity of Leydig cells in the testis occur as mice belonging to aggressive and nonaggressive lines mature. Capacity was observed to be at its peak during adulthood and the prepubertal age of 23 days in aggressive males.

Testing, Physiological aspects, Ontogeny, Leydig cells

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The role of body weight in resident-intruder aggression

Article Abstract:

Body weight is shown to be a significant determinant of the level of aggression and defensive behavior in a resident-intruder test of male NIH Swiss mice. Specific behavior patterns were manifested by Swiss mice grouped and housed based on their weight, whether light, average or heavy. A test of the effect of pharmacological intervention was also conducted but yielded no significant effects.

Research, Body weight, Defensiveness (Psychology)

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