伝書鳩の観察及び実験 I
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概要
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Summaries of various observations and experiments made by the author on Carrier Pigeons are given, as follows: Homing instinct A case of next day return of two escaped pigeons to a new loft after having been kept three months, is reported. The new loft which is painted white is 60 meters apart from the old unpainted one, and none of the five, including the above two, pigeons have since failed in returning to the new loft regularly (1955). A case of "bigamy" A white ♂ already mated with a red ♀ has bred with a white ♀, and then with the red ♀ again successfully. During the molting season confusion of bigamy occurred. Thus, the white ♀ was rejected, but instead, a blue ♀ took part anew in this bigamy. When the broods overlaped, the male engaged in the feeding of squabs and thus the incubating female was obliged a full-time job (1955). Sex ratio and color in F_1 A pair, red ♂ and blue ♀ with some white, produced 18 ♂♂ and 20 ♀♀ (few squabs died young) in their 22 broods 1951-1954 successively by overlaped breeding cycles. In color, males were, 8 white, 6 red and 4 blue, and the females, 6 white, 11 red and 3 blue. This result was compared with those given by Browne (1908) on the Barbs and Fantails. The red parent male used would have had a recessive-white gene, which, by help of incomplete-white of the female, would cause a high ratio of whites (cf. Browne, '08, pp. 84-5). The iris color was red in white and blue, birds and orange in reds. This correlation also differs from those given in Barbs and Fantails. Feeding reaction for squabs Squabs were put in the experiment-pens containing adults of various stages of reproductive cycle. Non-breeding individuals behaved against squabs as if they were birds of opposite sex. The feeding instinct was found to be working already after being mated, namely, before incubation period. This is suggested by the billing behavior, but is not accompanied by physiological readiness in the crop ("milk" formation).
- 1956-01-15