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CDRP

Lifetime Performance Index (LPI) Formula

30-MAR-2020

Where the relative emphasis placed on each of the three main components in each breed is presented in the following table along with the multiplicative factors for each component.

Where PY = Protein Yield, PD = Protein Deviation, FY = Fat Yield and FD = Fat Deviation, which are standardized using the appropriate averages (Avg) and standard deviations (SD) and then multiplied by their respective relative weight (W), all of which are breed specific as outlined in the following table.

Where HL = Herd Life, MS = Mammary System, F&L = Feet and Legs, HH = Hoof Health, DS = Dairy Strength and RP = Rump, and each trait is standardized using the appropriate averages and standard deviations and then multiplied by their respective relative weight (W) that is breed specific as outlined in the following table.

Where DF = Daughter Fertility, MR = Mastitis Resistance, SCS = Somatic Cell Score, UD = Udder Depth, MSP = Milking Speed and LP = Lactation Persistency.  The relative weights for each trait (i.e.: WDF, WMR, WSCS, WUD, WMSP and WLP respectively), which are specific to each breed, are provided in the following table.

 

 

 

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Previous LPI update documents:

April 2019

April 2018

April 2017
April 2016
August 2015
April 2015
April 2014
April 2013
April 2012
April 2011
January 2010
January 2009
January 2008
February 2007

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Copyright 2020 Canadian Dairy Network - May 29, 2020

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Copyright 2020 Canadian Dairy Network - May 29, 2020