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The composition of Australian fur seal (Arctocephalus pusillus doriferus) milk throughout lactation

journal contribution
posted on 1999-09-01, 00:00 authored by John ArnouldJohn Arnould, M A Hindell
The proximate chemical composition of milk was determined throughout lactation in the Australian fur seal (Arctocephalus pusillus doriferus Wood Jones), a temperate species with an 11-mo lactation period typical of most temperate otariids. Average lipid and protein contents were 42% and 10%, respectively, which is similar to that recorded for the polar otariid species but higher than reported in other temperate, long-lactation species. Milk composition, however, varied substantially throughout lactation, with lipid content rising from 30% soon after parturition to 50% at 230 d postpartum before decreasing to 45% toward weaning. The trend in water content was opposite to that of lipid, while protein content increased only slightly during lactation from 10% to 12%. The peak in lipid content occurred at approximately 70% of the way through lactation, similar to that found in the Australian sea lion and several phocid seal species. Significant positive relationships were found between milk lipid content and both the duration of the preceding foraging trip and body mass. A highly significant and close correlation was found between milk water and lipid contents such that gross energy content may be accurately predicted from water content alone. Similar predictive equations have been found for several other otariid and phocid species, but these appear to differ between phylogenetic groups.

History

Journal

Physiological and biochemical zoology

Volume

72

Issue

5

Pagination

605 - 612

Publisher

University of Chicago Press

Location

Chicago, Ill.

ISSN

1522-2152

eISSN

1537-5293

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

1999, University of Chicago