Document Detail

Cow level sampling factors affecting analysis and interpretation of milk urea concentrations in 2 dairy herds.
MedLine Citation:
PMID:  10416068     Owner:  NLM     Status:  MEDLINE    
The goals of this study were to determine the influence of the variations among udder quarters, the somatic cell count, the time of sampling during the day, sample conservation, and centrifugation on milk urea (UREA) concentrations, and to propose a sample collection procedure for herds that are not on a Dairy Herd Improvement (DHI) program. Forty cows from 2 herds with different feeding practices were randomly selected. The quarter sampled and the somatic cell count did not significantly influence UREA concentrations. Milk urea concentrations were highest in the morning. The diurnal pattern was not influenced by intrinsic factors like parity, days postpartum, or daily milk yield. The UREA concentrations were significantly higher after refrigeration for one week (mean UREA change = +0.41 +/- 0.24 mmol/L, P = 0.0001) and freezing for one month (mean UREA change = +1.52 +/- 1.25 mmol/L, P = 0.0001). Urea concentrations were slightly higher in lactoserum than in whole milk (mean UREA difference = +0.17 +/- 0.24 mmol/L, P = 0.0001). Although this study included only 2 herds and does not allow extrapolation, differences were found in the diurnal pattern of UREA in these 2 herds, which possibly reflect differences in feeding strategy. With consideration of these results, a 6-point sampling procedure for herds that are not on a DHI program is proposed.
R Eicher; E Bouchard; A Tremblay
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Canadian veterinary journal. La revue vétérinaire canadienne     Volume:  40     ISSN:  0008-5286     ISO Abbreviation:  Can. Vet. J.     Publication Date:  1999 Jul 
Date Detail:
Created Date:  1999-08-16     Completed Date:  1999-08-16     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  0004653     Medline TA:  Can Vet J     Country:  CANADA    
Other Details:
Languages:  eng     Pagination:  487-92     Citation Subset:  IM    
Clinic for Farm Animals and Horses, University of Bern, Switzerland.
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MeSH Terms
Circadian Rhythm
Milk / chemistry*,  cytology
Postpartum Period
Specimen Handling / methods,  veterinary
Time Factors
Urea / analysis*
Reg. No./Substance:

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