Sunday, April 21, 2019 |
Sign In
User Name: Password:  
CDRP

Lifetime Performance Index (LPI) Formula

20-MAR-2019

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.

Production Component (PROD):

PROD = [WPYx(PY-AvgPY)/SDPY] + [WPDxPD/SDPD] + [WFYx(FY-AvgFY)/SDFY] + [WFDxFD/SDFD]

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.

Durability Component (DUR):

DUR = [WHL x (HL - 100)/5] + [WMS x MS/5] + [WF&L x F&L/5] + [WHH x (HH – 100)/5] +

[WDS x DS/5] + [WRP x RP/5]

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.

Health & Fertility Component (H&F):

H&F = [WDF x (DF-100)/5] + [WMR x (MR-100)/5] + [WSCS x (SCS-100)/5] + [WUD x UD/5] +

[WMSP x (MSP-100)/5] + [WLP x (LP-100)/5]

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.

Download a PDF copy of this article

Previous LPI update documents:

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

« back

Copyright 2019 Canadian Dairy Network - April 21, 2019

Privacy | Disclaimer | Sitemap | Contact Us |

Copyright 2019 Canadian Dairy Network - April 21, 2019