Revista Chilena de Historia Natural 78 (2): 247-252, 2005
RESEARCH ARTICLE
Temporal dynamics of milk composition of the precocial caviomorph Octodon degus
(Rodentia: Octodontidae)
During lactation, both the nutritional and energetic requirements of suckling change
gradually. These changes normally are accompanied by modifications in chemical composition of the milk. We investigated the
temporal course of milk composition during lactation in a precocial caviomorph rodent, the “degu” (Octodon
degus) under laboratory condition. Female degus were kept in laboratory during gestation and lactation and fed with
commercial food pellets. Milk was collected at three stages of lactation: early (days 5 8, n = 12), middle (days 15-21, n = 7) and late
(days 26-40, n = 6), and analyzed for protein, carbohydrates, lipids, ash, total solids and energy. On average, carbohydrates decreased
from 3.1 ± 0.3 % (early) to 1.1 ± 0.3 % (late) during lactation; lipids, protein, ash, total solids and energy remained about the same.
Lipids, the main component of the milk, were 17.3 % and protein remained near 4.4 %. Over lactation, total energy concentration of
milk remained near 4.0 kJ mL<sup>-1</sup>. The maintenance of milk composition during lactation may be related to the
initially high energetic and nutritional requirements associated with a precocial reproductive mode.
Key words:
degu, precocial,
lactation, energy, lipids, milk composition
