非増殖集団における雄マウスの成長 : I. 空間の大きさが等しく、個体数が異なる環境での成長

概要

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The effects of different population sizes in equal space on growth of individuals were investigated in male mice of the ICR strain from 21 to 100 days of age. Based on individual differences in body weight, animals in each population were arbitrarily divided into 2 or 3 subgroups and statistical analyses were attempted among these subgroups. Subgroups L, M, and S consisted of animals with larger, average and smaller body weights, respectively, in each cage. The following results were obtained. (1) In a population of 20 mice, animals older than 40 days had significantly less body weight than those of the other populations. (2) No better growth was observed in animals housed singly than those of the other populations. (3) In a population of 2 mice, growth of both L and S seemed quite different in quality and uncomparable to that of the other populations. (4) In populations of 5 or more mice, inhibition of growth was observed in S and was intensified with an increase in population size. Inhibition of growth occurred after sexual maturation in both populations of 5 and 10 mice but before the onset of sexual maturity in a population of 20 mice.
社団法人日本動物学会の論文
1981-03-25