Research@Lincoln
    • Login
     
    View Item 
    •   Research@Lincoln Home
    • Metadata-only (no full-text)
    • Metadata-only (no full-text)
    • View Item
    •   Research@Lincoln Home
    • Metadata-only (no full-text)
    • Metadata-only (no full-text)
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Technical note: Nitrogen isotopic fractionation can be used to predict nitrogen-use efficiency in dairy cows fed temperate pasture

    Cheng, Paul; Sheahan, AJ; Gibbs, Steven; Rius, AG; Kay, JK; Meier, S; Edwards, Grant; Dewhurst, Richard; Roche, JR
    Abstract
    The objective of this study was to investigate the relationship between nitrogen isotopic fractionation (δ¹⁵N) and nitrogen-use efficiency (milk nitrogen/nitrogen intake; NUE) in pasture-fed dairy cows supplemented with increasing levels of urea to mimic high rumen degradable protein pastures in spring. Fifteen cows were randomly assigned to freshly cut pasture and either supplemented with 0, 250, or 336 g urea/d. Feed, milk, and plasma were analyzed for δ¹⁵N, milk and plasma for urea nitrogen concentration, and plasma for ammonia concentration. Treatment effects were tested using ANOVA and relationships between variables were established by linear regression. Lower dry matter intake (P = 0.002) and milk yield (P = 0.002) occurred with the highest urea supplementation (336 g urea/d) compared with the other two treatments. There was a strong linear relationship between milk δ¹⁵N - feed δ¹⁵N and NUE: [NUE (%) = 58.9 - 10.17 × milk δ¹⁵N - feed δ¹⁵N (‰) (r² = 0.83, P < 0.001, SE = 1.67)] and between plasma δ¹⁵N - feed δ¹⁵N and NUE: [NUE (%) = 52.4 - 8.61 × plasma δ¹⁵N - feed δ¹⁵N (‰) (r² = 0.85, P < 0.001, SE = 1.56)]. This study confirmed the potential use of δ¹⁵N to predict NUE in cows consuming different levels of rumen degradable protein.... [Show full abstract]
    Keywords
    nitrogen-15; rumen degradable protein; sustainablity; urea utilization; Milk; Animals; Cattle; Nitrogen; Urea; Diet; Climate; Lactation; Animal Husbandry; Animal Feed; Dietary Supplements; Female; Animal Nutritional Physiological Phenomena; Animal Feed; Animal Husbandry; Animal Nutritional Physiological Phenomena; Animals; Cattle; Climate; Diet; Dietary Supplements; Female; Lactation; Milk; Nitrogen; Urea
    Fields of Research
    0702 Animal Production; 070204 Animal Nutrition
    Date
    2013-12
    Type
    Journal Article
    Collections
    • Metadata-only (no full-text) [5320]
    View/Open
    Share this

    on Twitter on Facebook on LinkedIn on Reddit on Tumblr by Email

    DOI
    https://doi.org/10.2527/jas.2012-5378
    Metadata
     Expand record
    © 2013 American Society of Animal Science. All rights reserved.
    Citation
    Cheng, L., Sheahan, A. J., Gibbs, S. J., Rius, A. G., Kay, J. K., Meier, S., . . . Roche, J. R. (2013). Technical note: Nitrogen isotopic fractionation can be used to predict nitrogen-use efficiency in dairy cows fed temperate pasture1. Journal of Animal Science, 91(12), 5785-5788. doi:10.2527/jas.2012-5378
    This service is maintained by Learning, Teaching and Library
    • Open Access Policy
    • Copyright and Reuse
    • Deposit Guidelines and FAQ
    • Contact Us
     

     

    Browse

    All of Research@LincolnCommunities & CollectionsTitlesAuthorsKeywordsBy Issue DateThis CollectionTitlesAuthorsKeywordsBy Issue Date

    My Account

    LoginRegister

    Statistics

    View Usage Statistics
    This service is maintained by Learning, Teaching and Library
    • Open Access Policy
    • Copyright and Reuse
    • Deposit Guidelines and FAQ
    • Contact Us