Cow level sampling factors affecting analysis and interpretation of milk urea concentrations in 2 dairy herds

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...

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Bibliographic Details
Published in:Canadian veterinary journal 1999-07, Vol.40 (7), p.487-492
Main Authors: Eicher, R, Bouchard, E, Tremblay, A
Format: Article
Language:English
Subjects:
Animals
Cattle
centrifugation
Circadian Rhythm
dairy cows
dairy herds
diurnal variation
duration
Female
Lactation
milk
Milk - chemistry
Milk - cytology
nutrition assessment
Postpartum Period
sample storage
sampling
somatic cell count
Specimen Handling - methods
Specimen Handling - veterinary
Time Factors
udder quarters
urea
Urea - analysis
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Summary: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.
ISSN:0008-5286