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generally lower than the bulk tank result. Comparison of bulk tank and sensor averages may be useful in detecting sensor problems or calibration issues.
Implementation of Feed Efficiency Evaluations for Holsteins
The objective in developing a Feed Efficiency genetic evaluation is to improve Feed Efficiency, not simply reduce feed intake (DMI). Thus, there is a need to take into account energy required for:
Maintenance - Metabolic Body Weight (MBW)
Production: Energy Corrected Milk (ECM)
The model would use these three first lactation traits (weekly averages) for DMI, MBW and ECM. Each trait defined in two time periods:
Up to 60 DIM After 60 DIM
Increased
CHRISTMAS 2020 ❆ BC HOLSTEIN NEWS 27
    Friday, January 8, 2021 STARTING AT 10:00 AM
KEYNOTE SPEAKER: Nick Black - Marketing Milk in 2021
DUE TO COVID-19 RESTRICTIONS, THIS WILL BE A VIRTUAL AGM.
Mainland Milk Producers Association
Notice of
Annual General Meeting
  JAMIESON CREEK CATTLE
 CUSTOM HEIFER RAISING
• Keep your genetics in your herd
• Get your heifers off concrete and
into our brand-new dry lot facility
• Enhance respiratory and hoof
performance in our dry interior climate
• Full vaccination protocol
• AI breeding
• Specializing in calves
from 6 months and up
KAMLOOPS B.C.
CONTACT:
Kevin Mammel 604-703-9992 Glenn Degroot 604-819-5019 Aaron Neels 604-819-5136
   Call now to see how we can fit into your farm’s Expansion plans!
    More information will be sent directly to
MMPA members via e-mail in December.
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      After calculating separate trait evaluations,
proofs would be combined from the three
traits to calculate a measure of Feed
Efficiency (FE) i.e. how much does the
animal eat relative to requirements for
Maintenance and Production (Energy
Sinks), which is calculated by taking the
Feed Intake (DMI) and subtracting what is
needed for Maintenance and Production.
From there, proofs would be defined in two
time periods; in 1st lactation separately:
5 – 60 DIM where the objective is to avoid
reduction in feed intake and for 61 – 305
DIM where the objective is to improve feed efficiency.Theevaluationwillbeequivalentter to Residual Feed Intake (RFI) and will be
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Early Lactation
• Energy Corrected Milk (ECM1)*0.34
• Metabolic Body Weight (MBW1)*0.57 s • Dry Matter Intake (DMI1)*0.29
• Residual Feed Intake (RFI1)*0.10
Mid‐late Lactation
• Energy Corrected Milk (ECM2)*0.29
• Metabolic Body Weight (MBW2)*0.59
• Dry Matter Intake (DMI2)*0.27
• Residual Feed Intake (RFI2)*0.05
Relative Breeding Values (RBV) would be expressed like Health traits with an average = 100 and Standard Deviation (SD) = 5 for base sires. There would be a reverse sign for RBV of DMI and RFI (larger = better). To obtain an official evaluation, a sire would need at least five daughters with DMI data and a minimum reliability of GEBV for RFI2 (=FE) of 50%.
We can expect more information leading up to the first release in Canada for Feed Efficiency evaluations as April 2021 gets nearer.
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