Abstract
Population growth curves of random-bred mice confined in 18 dm 2 cages show, after a steep increase, a period of numerical equilibrium from about the 12th week, with an average density of 400 animals m 2. After this period, a progressive decrease is observed, until all the animals die after 700–1000 days. Chronic administration of caffeine and amphetamine induces a block of the population growth; different components of aggressiveness can be identified as responsible. On the contrary, high doses of nicotine do not affect either the population growth or its structure.
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