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1 Acta Theriologica

1 2003

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Body composition and gut length of Akodon azarae [Muridae: Sigmodontinae]: relationship with energetic requirements

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Del V. J. C. , Busch C.

nr 3

Akodon azarae (J. Fischer, 1829) is a small omnivorous murid rodent that lives in environments with seasonal fluctuations of food. Seasonal variation in its body composition and gut length, in relation to reproductive status, was studied. Physical Condition Index (PCI) and body composition showed seasonal differences, however, there were no differences in intestine length. The PCI was higher for both mature males and reproductive females compared to immature males and non-reproductive females. Lipid, protein and ash content showed differences in relation to reproductive status. The results suggest that A. azarae meets the additional costs of pregnancy and lactation by increasing energy intake, without relying on reserves.