Document Detail

Changes in protein and nutrient composition of milk throughout lactation in dogs.
MedLine Citation:
PMID:  11497449     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To evaluate changes in protein and nutrient composition of milk throughout lactation in dogs. SAMPLE POPULATION: Milk samples collected from 10 lactating Beagles. PROCEDURE: Milk samples were collected on days 1, 3, 7, 14, 21, 28, 35, and 42 after parturition and analyzed to determine concentrations of nitrogen, nonprotein nitrogen, casein, whey proteins, amino acids, lipids, lactose, citrate, minerals, and trace elements. Optimum conditions for separating casein from whey proteins and distribution of milk proteins throughout lactation were assessed by use of polyacrylamide gel electrophoresis. RESULTS: Protein concentration was high in samples collected on day 1 (143 g/L), decreased through day 21 (68.4 g/L), and increased thereafter. Concentration of nonprotein nitrogen did not change throughout lactation (5.7 to 9.9% of total nitrogen content). Casein-to-whey ratio was approximately 70:30 and remained constant throughout lactation. Lactose concentration increased from 16.6 g/L on day 1 to 34.0 to 40.2 g/L on days 7 to 42. Lipid concentration ranged from 112.5 to 1372 g/L. Citrate concentration increased from day 1 (4.8 mM) to day 7 (6.6 mM), then gradually decreased until day 42 (3.9 mM). Iron, zinc, copper, and magnesium concentrations decreased during lactation, whereas calcium and phosphorus concentrations increased. Calcium-to-phosphorus ratio remained constant throughout lactation (approx 1.6:1). Energy content of milk ranged from 1,444 to 1,831 kcal/L. CONCLUSIONS AND CLINICAL RELEVANCE: Protein and nutrient composition of milk changes throughout lactation in dogs. These data can provide valuable information for use in establishing nutrient requirements of puppies during the suckling period.
Y Adkins; A J Lepine; B Lönnerdal
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  American journal of veterinary research     Volume:  62     ISSN:  0002-9645     ISO Abbreviation:  Am. J. Vet. Res.     Publication Date:  2001 Aug 
Date Detail:
Created Date:  2001-08-10     Completed Date:  2002-01-22     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0375011     Medline TA:  Am J Vet Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1266-72     Citation Subset:  IM    
Department of Nutrition, College of Agricultural and Environmental Sciences, University of California, Davis 95616, USA.
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MeSH Terms
Amino Acids / metabolism
Animal Nutritional Physiological Phenomena*
Caseins / metabolism*
Citric Acid / metabolism
Dogs / metabolism,  physiology*
Electrophoresis, Polyacrylamide Gel / veterinary
Lactation / physiology*
Lactose / metabolism
Lipid Metabolism
Longitudinal Studies
Milk / metabolism*
Milk Proteins / metabolism*
Minerals / metabolism
Nitrogen / metabolism
Reg. No./Substance:
0/Amino Acids; 0/Caseins; 0/Milk Proteins; 0/Minerals; 0/whey protein; 63-42-3/Lactose; 77-92-9/Citric Acid; 7727-37-9/Nitrogen

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