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Cross-fostering for the conservation of rat-kangaroos (Marsupialia: Potoroidae)


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Sterneberg, B 2005 , 'Cross-fostering for the conservation of rat-kangaroos (Marsupialia: Potoroidae)', PhD thesis, University of Tasmania.

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Cross-fostering is an assisted reproductive method that has been used to improve
the_ productivity of endangered marsupial fauna. Pouch young from
endangered species are transferred to the pouch of related common species,
allowing the donor female to produce further offspring without going through the
entire lactation cycle.
In this project I tested the applicability of cross-fostering in rat-kangaroos (family
Potoroidae) using the Tasmanian bettong (Bettongia gaimardt) and the Longnosed
potoroo (Potorous tridacty/us) as model species. The effect of a 'transfer
age difference' (TAD) between transferred young was investigated to determine
the most beneficial time for pouch young transfer: optimising both the mother's
reproductive rate and young's survival to independence.
Thirty two young were transferred, 18 intra-species and 14 inter-species. The
transfers were carried out at various stages of pouch life (1 to 11 weeks) with
TADs ranging from 0 to 3 weeks. Nutritional analyses were undertaken on 460
milk samples. Growth measurements and development data were obtained for
110 bettong and 46 potoroo young. The effect of cross-fostering on species specific
behaviour patterns was investigated using both video-recordings and
direct observations.
Twenty one young survived and 19 subsequently bred successfully. Milk composition
and production rates did not appear to be affected by transfers. Comparisons
of growth rates between cross-fostered and either fostered or
untransferred young showed an advantage for cross-fostered potoroos and a
disadvantage for cross-fostered bettong. These were most pronounced during
the period between pouch vacation and weaning. During asynchronous intraspecies
transfers the younger of the two transferees grew faster than untransferred
bettong young. The magnitude of both these effects increased with TAD
up to an age difference of three weeks when growth related problems appeared.
Although cross-fostered young were influenced by transfer mothers' behaviour, they developed normal pecies-specific behaviour. Difficulties in reuniting cross-fostered young with their own species were probably a consequence of different levels of sociability in the two species. At maturity, all surviving transfer young were successful in both mate recognition and production of offspring.
Growth and development of the transfer young are affected by the design of the
fransfer procedure. The combination of species, temperament and experience
of the transfer mother; the age of young at transfer arid the TAD all affect the
outcome. The accessibility of the young in the pouch enables progress monitoring
and, where required, early intervention for repeated transfers and/or
hand-rearing. Recommendations for the management of transfer animals in
captivity are provided.

Item Type: Thesis - PhD
Authors/Creators:Sterneberg, B
Keywords: Potoroidae
Copyright Holders: The Author
Copyright Information:

Copyright 2005 the Author - The University is continuing to endeavour to trace the copyright
owner(s) and in the meantime this item has been reproduced here in good faith. We
would be pleased to hear from the copyright owner(s).

Additional Information:

For consultation only. No loan or copying permitted until 2nd March 2007. Thesis (Ph.D.)--University of Tasmania, 2005. Includes bibliographical references. Includes notes in back pocket

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