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    • IJAFR, volume 45, 2006
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    • IJAFR, volume 45, 2006
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    Modelling fat and protein concentration curves for Irish dairy cows

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    Author
    Quinn, N.
    Killen, L.
    Buckley, Frank
    Keyword
    Analysis of residuals
    Lactation curves
    Milk constituents
    Modelling
    Date
    2006
    
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    URI
    http://hdl.handle.net/11019/607
    Citation
    N. Quinn, L. Killen and F. Buckley. Modelling fat and protein concentrationcurves for Irish dairy cows. Irish Journal of Agricultural and Food Research 45: 13–23, 2006
    Abstract
    The objective of this study was to acquire a well-fitting, single-equation model that would represent the fat and protein concentration curves of milk from Irish dairy cows. The dataset consisted of 16,086 records from both spring and autumn calving cows from both experimental and commercial herds. Many models cited in the literature to represent milk yield were examined for their suitability to model constituent curves. Models were tested for goodness-of-fit, adherence to the assumptions of regression analysis, and their ability to predict total fat and protein concentration for an entire lactation. Wilmink’s model best satisfied these criteria. It had the best Mean Square Prediction Error (goodness-of-fit) value, it satisfied the assumptions of regression analysis (multicollinearity, heteroskedasticity, autocorrelation and normality of distribution), and it predicted the actual concentration of the constituents to within 0.01 percentage point.
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    IJAFR, volume 45, 2006
    Animal & Bioscience

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