伝書鳩の観察及び実験 II
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概要
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A series of experiments on the "psychological brooding" (Patel, '36) of Carrier Pigeon, made by the author in 1940, are reported. Individuals varying in sex, age or breeding condition, were put for experiment in the pen where they were allowed to see through partition an incubating one, and the crop condition of experimentals was tested by taking a small piece from a lateral pouch which becomes hypertrophied to descamate "pigeon milk" at the end of incubation period in normal state. The result of experiments are: 1) In mated pairs, to see the incubating female stimulated the old male's crop-wall to produce "milk;" in the young individuals this was correlated with the maturity of gonad (positive result after about 8 month old). 2) When males were left to incubate alone, they usually got less eager in their job, except in few cases, and the crop conditon of the female seeing her mate's incubation was dependent upon the latter's behavior. 3) In non-mated or already-mated (with other female) males, to see an incubating female did not stimulate their crop, as they usually commenced, after a quarrel, their new mating period which lasted at least 20 days when partition was removed. 4) When females were put in to be allowed to look at an incubating female, this became egg-laying, as well as crop-stimulating impulse in a mated female, and not the crop-stimulating impules in two non-mated ones. 5) Thus, the crop-stimulating impules by "psychological brooding" is activated after the pigeons (in both sexes) are conditioned by mating.
- 1956-01-15
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