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• W973377218 abstract "Cross-fostering is an assisted reproductive method that has been used to improvethe_ productivity of endangered marsupial fauna. Pouch young fromendangered species are transferred to the pouch of related common species,allowing the donor female to produce further offspring without going through theentire lactation cycle.In this project I tested the applicability of cross-fostering in rat-kangaroos (familyPotoroidae) using the Tasmanian bettong (Bettongia gaimardt) and the Longnosedpotoroo (Potorous tridacty/us) as model species. The effect of a 'transferage difference' (TAD) between transferred young was investigated to determinethe most beneficial time for pouch young transfer: optimising both the mother'sreproductive rate and young's survival to independence.Thirty two young were transferred, 18 intra-species and 14 inter-species. Thetransfers were carried out at various stages of pouch life (1 to 11 weeks) withTADs ranging from 0 to 3 weeks. Nutritional analyses were undertaken on 460milk samples. Growth measurements and development data were obtained for110 bettong and 46 potoroo young. The effect of cross-fostering on species specificbehaviour patterns was investigated using both video-recordings anddirect observations.Twenty one young survived and 19 subsequently bred successfully. Milk compositionand production rates did not appear to be affected by transfers. Comparisonsof growth rates between cross-fostered and either fostered oruntransferred young showed an advantage for cross-fostered potoroos and adisadvantage for cross-fostered bettong. These were most pronounced duringthe period between pouch vacation and weaning. During asynchronous intraspeciestransfers the younger of the two transferees grew faster than untransferredbettong young. The magnitude of both these effects increased with TADup 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 thefransfer procedure. The combination of species, temperament and experienceof the transfer mother; the age of young at transfer arid the TAD all affect theoutcome. The accessibility of the young in the pouch enables progress monitoringand, where required, early intervention for repeated transfers and/orhand-rearing. Recommendations for the management of transfer animals incaptivity are provided." @default.
• W973377218 created "2016-06-24" @default.
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• W973377218 date "2005-01-01" @default.
• W973377218 modified "2023-09-24" @default.
• W973377218 title "Cross-fostering for the conservation of rat-kangaroos (Marsupialia: Potoroidae)" @default.
• W973377218 hasPublicationYear "2005" @default.
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