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Responses of milk urea nitrogen content to dietary crude protein level and degradability in lactatingHolsteindairy cows

Author

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  • S.W. Zhai

    (Institute of Dairy Science, Zhejiang University, Hangzhou, China
    Fishery College of Jimei University, Xiamen, China)

  • J.X. Liu

    (Institute of Dairy Science, Zhejiang University, Hangzhou, China)

  • Y.M. WU

    (Institute of Dairy Science, Zhejiang University, Hangzhou, China)

  • J.A. YE

    (Institute of Dairy Science, Zhejiang University, Hangzhou, China)

  • Y.N. XU

    (Institute of Dairy Science, Zhejiang University, Hangzhou, China)

Abstract

Two experiments were conducted to investigate the effects of dietary crude protein level and degradability on milk urea nitrogen (MUN) content. In experiment 1, twelve multiparous lactating cows averaging 176 days in milk were divided according to DIM and milk production into three 4 × 4 Latin squares with four 2-week periods. Cows were fed four diets with different crude protein levels (13.0, 14.0, 15.0, and 16.0%, DM basis) with isocaloric, respectively. Crude protein levels had a low effect on milk yield and composition (P > 0.05), but a significant effect on MUN content. There were significant differences in the MUN content of cows fed either of the two diets (P < 0.01). In experiment 2, fifteen multiparous Holstein dairy cows averaging 91 days in milk were classified according to DIM and milk production into five 3 × 3 Latin squares with three 3-week periods. Cows were fed one of the three isocaloric and isonitrogenous diets with RUP being 30.8%, 36.2%, and 41.6% (CP basis), respectively. Milk yield, milk composition, and MUN content were not significantly affected by protein degradability, and there were no significant differences between any two dietary treatments (P > 0.05). These results indicated that MUN might be used as a parameter to monitor the change in dietary protein levels.

Suggested Citation

  • S.W. Zhai & J.X. Liu & Y.M. WU & J.A. YE & Y.N. XU, 2006. "Responses of milk urea nitrogen content to dietary crude protein level and degradability in lactatingHolsteindairy cows," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 51(12), pages 518-522.
    • Handle: RePEc:caa:jnlcjs:v:51:y:2006:i:12:id:3972-cjas
    DOI: 10.17221/3972-CJAS
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    Citations

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    Cited by:

    1. O. Hanuš & J. Vegricht & J. Frelich & A. Macek & M. Bjelka & F. Louda & L. Janů, 2008. "Analysis of raw cow milk quality according to free fatty acid contents in the Czech Republic," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 53(1), pages 17-30.
    2. K. Poláková & V. Kudrna & A. Kodeš & B. Hučko & Z. Mudřík, 2010. "Non-structural carbohydrates in the nutrition of high-yielding dairy cows during a transition period," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 55(11), pages 468-478.
    3. P. Hering & O. Hanuš & J. Frelich & J. Pytloun & A. Macek & L. Janů & J. Kopecký, 2008. "Relationships between the results of various methods of urea analysis in native and enriched milk," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 53(2), pages 64-76.
    4. M. Czauderna & J. Kowalczyk, 2012. "Simple, selective, and sensitive measurement of urea in body fluids of mammals by reversed-phase ultra-fast liquid chromatography," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 57(1), pages 19-27.
    5. K. Yazgan & J. Makulska & A. Węglarz & E. Ptak & M. Gierdziewicz, 2010. "Genetic relationship between milk dry matter and other milk traits in extended lactations of Polish Holstein cows," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 55(3), pages 91-104.
    6. O. Hanuš & P. Hering & J. Frelich & M. Jílek & V. Genčurová & R. Jedelská, 2008. "Reliability of results of milk urea analysis by various methods using artificial milk control samples," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 53(4), pages 152-161.

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