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Growth of an australian murid pseudomys novaehollandiae in the wild



Growth of an australian murid pseudomys novaehollandiae in the wild



Acta Theriologica 24(12-21): 257-266



Specimens of P. novaehollandiae (Waterhouse, 1843) were live-trapped for dissection (1972-1974), and capture-mark-release (1974-1976) studies were done in central coastal New South Wales, Australia. Body weights of single and multiple capture animals less than 1 yr old are used to describe growth under natural conditions. Variations in growth rate are related to time of birth within the breeding season (early- or late-born cohorts) and rate of sexual development (mature or immature during the season of birth). Animals which matured grew more quickly than those which remained immature until the following season. As a group, mature individuals reached a higher asymptotic weight (16.4 g) than immature individuals (14.9 g) and attained 90% of this asymptote at a younger age (60 days compared to 75 days). Individual growth records showed that this difference in growth rate only became apparent after 50 days of age. The early-born cohort grew more raidly than the late-born but the difference was minimal if mature animals were excluded from the analysis. Final body weight and overall growth pattern were similar under field and laboratory conditions except that laboratory animals weighed more when under 30 days of age.

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Accession: 005541061

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