
TY  - JOUR
A1  - Logan, M. 
A1  - Sanson, G. D. 
T1  - The effects of lactation on the feeding behaviour and activity patterns of free-ranging female koalas (<emph type="2">Phascolarctos cinereus</emph> Goldfuss)
JF  - Australian Journal of Zoology
JO  - Aust. J. Zool.
Y1  - 2003
VL  - 51
IS  - 4
SP  - 415
EP  - 428
KW  - 
UR  - https://doi.org/10.1071/ZO03017 
N2  - The free-ranging feeding behaviour and activity patterns of three lactating and two non-lactating female koalas (Phascolarctos cinereus) were investigated using acoustically sensitive radio-telemetry. Lactating females were found to consume more leaf material, masticate more per leaf and at a greater rate, and perform more ingestive and mercyism mastications per 24 h than non-lactating females. Results suggest than female koalas are &#39;income breeders&#39; that compensate for the higher energetic demands of lactation by increasing intake and, to a lesser degree, investing more in each mouthful so as to produce a shift in digesta particle size distribution in favour of more finer particles. Compared with non-lactating females, lactating female koalas were also found to spend more time moving within trees, feeding per 24 h and per bout, and less time resting and sleeping per 24 h, although the proportion of active time spent feeding was similar (~80%). This implies that female koalas adopt a 'time minimizing strategy whereby activity budgets respond to current requirements. Lactation-compensation mechanisms are compared with those reported for koalas with high tooth wear, and the capacity of aging female koalas to compensate for lactation are discussed. 
ER  -

