Document Detail

Milk intake and energy expenditure of free-ranging northern fur seal, Callorhinus ursinus, pups.
MedLine Citation:
PMID:  11880973     Owner:  NLM     Status:  MEDLINE    
Milk ingested by mammalian offspring, coupled with offspring's utilization of this energetic investment, influences survival and growth. A number of studies have examined milk intake in otariids, but few have examined milk intake over the entire lactation period, and none has independently measured energy expenditure concurrent with milk intake. We concurrently examined milk intake, field metabolic rate (FMR), and body composition of 41 pups over the entire lactation interval in 1995 and 1996 on St. Paul Island, Alaska. One hundred two metabolic measurements were obtained with isotope dilution methods. Mean milk intake did not differ annually but increased with age and mass, ranging from 3,400+/-239 to 6,780+/-449 (+/-SE) mL per suckling bout. Milk energy consumption did not vary with age on a mass-specific basis. No differences were detected in milk volume consumed by male and female pups, either absolutely or on a mass-specific basis. Mass-specific FMR peaked during molting, was lowest postmolt, and did not vary by sex. Pups in 1995 had lower FMR than pups in 1996 and were also fatter. Mean milk energy utilized for maintenance metabolism decreased over time from 77% to 43% in 1995 and remained at 71% in 1996. Pup body mass was negatively correlated with the percentage of total body water and positively correlated with the percentage of total body lipid (TBL). Pups increased the percentage of TBL from 16% to 37%. Northern fur seal pups increased energy intake over lactation, while concurrent changes in body composition and pelage condition resulted in mass-specific metabolic savings after the molt.
M J Donohue; D P Costa; E Goebel; G A Antonelis; J D Baker
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Physiological and biochemical zoology : PBZ     Volume:  75     ISSN:  1522-2152     ISO Abbreviation:  Physiol. Biochem. Zool.     Publication Date:    2002 Jan-Feb
Date Detail:
Created Date:  2002-03-07     Completed Date:  2002-04-30     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  100883369     Medline TA:  Physiol Biochem Zool     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3-18     Citation Subset:  IM    
University of California, Santa Cruz, CA 95064, USA.
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MeSH Terms
Animal Nutritional Physiological Phenomena*
Animals, Suckling / growth & development*,  physiology
Body Composition
Body Weight / physiology
Energy Intake / physiology*
Energy Metabolism / physiology*
Fur Seals / growth & development*,  physiology
Molting / physiology
Weight Gain / physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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