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Dairy Management - Milk Curve Fitter

Milk Curve Fitter

Afshin Kalantari and Victor E. Cabrera, UW-Madison Dairy Science


Tool Overview

This tool converts observed dairy herd production data into a prediction function. The user enters herd milk production at several points during the lactation (e.g., the average milk production every 30 days after calving for second lactation cows). The tool then uses these data to “fit” a production function and to find the best coefficients that explain the data as lactation curves (Curve Fitter tab). User has the option to select from two very popular functions to fit those curves: Milkbot (4 parameters, Fig.1) or Woods (3 parameters, Fig.2). The result of fitting is the coefficient values of the selected function (functions in mathematical terms are provided). Once the milk production function has been determined, the tool has the capability of graphing the resulting lactation curve (daily milk production against days postpartum). The tool has also the capability of selecting a user-defined area of the lactation curve and calculates the milk production during such period (Daily Milk Production tab). Additionally, the tool allows the user to “play” with the model parameters (Test Model Parameters tab) and explore the impact of expected milk production when different lactation curves.

The tool is very effective for projections and economic analyses of the dairy herd and can be used for decision-making within many areas of dairy farm management such as reproduction, health, nutrition, genetics, among others.


MilkBot's Model
Fig.1: MilkBot's Model
Wood's Model
Fig.2: Wood's Model










Acknowledgements


  • 64x64
    USDA - National Institute of Food and Agriculture
    This project is supported by Agriculture and Food Research Initiative Competitive Grant No. 2010-85122-20612 from the USDA National Institute of Food and Agriculture.
  • 64x64
    University of Wisconsin-Madison
    This project is supported by US Department of Agriculture Hatch project to V.E. Cabrera WIS01577.
INPUTS - Edit Values in This Block

Total Milk Production from


OUTPUTS - Total Milk Production
  • Milk from day 50 to 200, lb 13,565.37

INPUTS - Edit Values in This Block

Total Milk Production from


OUTPUTS - Total Milk Production
  • Milk from day 50 to 200, lb 13,565.37
Parameter Value
a
b
c
d


INPUTS

Download Parameter Excel File

Upload Parameters as Excel File



OUTPUTS - Parameters Value
Parameter Value
a 112.3355
b 18.9885
c 0.3467
d 0.0018