Environmental factors influencing milk urea nitrogen in South African Holstein cattle

dc.contributor.authorKgole, M.L. (Matlou Lebogang)
dc.contributor.authorVisser, Carina
dc.contributor.authorBanga, C.B.
dc.date.accessioned2012-09-26T06:42:15Z
dc.date.available2012-09-26T06:42:15Z
dc.date.issued2012
dc.description.abstractBy knowing the milk urea nitrogen (MUN) content of dairy cows, the efficiency of dietary nitrogen utilization can be improved. The main objectives of this study were to identify and quantify environmental factors affecting MUN in South African Holstein cows. This will enable better interpretation of MUN results by accounting for such factors. A total of 82 900 test-day records of 9 901 Holstein cows from 40 herds participating in the South African National Milk Recording and Improvement Scheme (NMRIS) during the period 2007 to 2010 were used. An analysis of variance was performed to determine environmental factors significantly affecting MUN. Significant factors were herd-test-day, year of calving, parity, number of times milked per day and lactation stage. Herd-test-day had the largest effect, accounting for 48.3% of the total variation. Trends in least squares (LS) means for MUN over lactation stages were similar for all parities; however, means were slightly lower in parity 3 than the first two parities. The LS mean for 2008 was the lowest (13.9 mg/dL) in comparison to other years. Cows milked twice daily had a higher MUN LS mean (15.5 mg/dL) in comparison to those milked three times per day (13.4 mg/dL). Results of this study provided the basis for proper use and better interpretation of MUN data.en_US
dc.description.urihttp://www.sasas.co.zaen_US
dc.identifier.citationKgole, ML, Visser, C & Banga, CB 2012, 'Environmental factors influencing milk urea nitrogen in South African Holstein cattle', South African Journal of Animal Science, vol. 42, no. 5, pp. 459-463.en_US
dc.identifier.issn0375-1589 (print)
dc.identifier.issn222-4062 (online)
dc.identifier.other10.4314/sajas.v42i5.3
dc.identifier.urihttp://hdl.handle.net/2263/19892
dc.language.isoenen_US
dc.publisherSouth African Society for Animal Scienceen_US
dc.rightsCopyright resides with the authors in terms of the Creative Commons Attribution 2.5 South African Licence.en_US
dc.subjectMilk urea nitrogenen_US
dc.subjectEnvironmental factorsen_US
dc.subjectDairy herd managementen_US
dc.titleEnvironmental factors influencing milk urea nitrogen in South African Holstein cattleen_US
dc.typeArticleen_US

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