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Please use this identifier to cite or link to this item: http://hdl.handle.net/11019/607

Title: Modelling fat and protein concentration curves for Irish dairy cows
Authors: Quinn, N.
Killen, L.
Buckley, Frank
Keywords: Analysis of residuals
Lactation curves
Milk constituents
Modelling
Issue Date: 2006
Publisher: Teagasc, Oak Park, Carlow, Ireland
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
Series/Report no.: Irish Journal of Agricultural and Food Research;vol 45
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.
Description: peer-reviewed
URI: http://hdl.handle.net/11019/607
ISSN: 0791-6833
Appears in Collections:Animal & Bioscience
IJAFR, volume 45, 2006

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