Consideration on Successive Breeding in Captivity

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  • MASUI Mitsuko
    Director Tokyo Metropolitan Government, Bureau of Construction Director I.A.C.(International Aquarium Congress) Park Division

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  • 動物園動物の累代飼育についての考察

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Abstract

The species survival programme of animals has been valued more and more as zoo conservation in the zoo community. For such protection work, successive breeding in captivity of zoo animals(including wild animals)should be concentrated upon. However, the following problems need to be considered for continuing successive breeding: (1)Maintaining proper population within an enclosure with certain space is important for the health management of the group. Overpopulation leads to a high new-born mortality rate and is subject to infectious diseases due to soil pollution in the enclosure. (2)Precocious trend is observed in many animal species. (3)Minituarization and changes in figures are observed. The reason of the phenomenon seems decrease in osseo-dentisy(the osseo-dentisy of zoo animals is much lower compared with that of wild animals). (4)Careful treatments to avoid wrong imprinting is needed where hand rearing is under way. (5)A group of a small founder will end in deterioration if it is left as it is. Renewal of blood is essential. Above problems seem to relate with phases of domestication, and such domestication must be avoided where zoos aim to keep native characters of wild animals whenever possible. Zoos must do our best to give animals an ethologically/physically suitable breeding environment and to display the function fully as a captive breeding base of rare animals.

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