Effect of herd, parity, stage of lactation and milk yield on urea concentration in milk

F. Jílek, D. Řehák, J. Volek, M. Štípková, E. Němcová, M. Fiedlerová, R. Rajmon and D. Švestková
Additional contact information
F. Jílek: Department of Veterinary Science, Czech University of Agriculture, Prague, Czech Republic
D. Řehák: Research Institute of Animal Production, Prague, Czech Republic
J. Volek: Research Institute of Animal Production, Prague, Czech Republic
M. Štípková: Research Institute of Animal Production, Prague, Czech Republic
E. Němcová: Research Institute of Animal Production, Prague, Czech Republic
M. Fiedlerová: Research Institute of Animal Production, Prague, Czech Republic
R. Rajmon: Department of Veterinary Science, Czech University of Agriculture, Prague, Czech Republic
D. Švestková: Department of Veterinary Science, Czech University of Agriculture, Prague, Czech Republic

Czech Journal of Animal Science, 2006, vol. 51, issue 12, 510-517

Abstract: The objective of this study was to determine how non-nutritional factors such as herd, parity, days in milk, milk production, and milk components affect the concentration of milk urea. A retrospective, observational study comprising analyses of individual cow records from monthly dairy herd improvement milk tests including milk urea tests was conducted. Six commercial Holstein dairy herds were involved in the investigation from October 2000 to September 2003. The data were evaluated using the mixed linear model with repeated measures, and parameters were estimated by the REML method. Significant differences in milk urea concentrations were observed between herds (P < 0.0001), with a significant variability between test dates within herds. Significant effects of parity (P = 0.0003), days in milk (P < 0.0001), and their interaction were also found. Higher concentrations of milk urea were determined in the cows on the first and second parity (5.63 and 5.62 mmol/l, respectively) compared to the groups of cows on the third and fourth parity (5.47 mmol/l). It was found that milk urea concentration increased with the square of milk yield (P < 0.0001), while a negative quadratic relationship was found between milk urea concentration and milk fat % (P < 0.0001). It was concluded that milk urea concentration should be evaluated in association with days in milk, milk yield, milk fat %, and milk protein %.

Keywords: dairy cow; milk urea; non-nutritional factors (search for similar items in EconPapers)
Date: 2006
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Citations: View citations in EconPapers (5)

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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlcjs:v:51:y:2006:i:12:id:3971-cjas

DOI: 10.17221/3971-CJAS

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