Tuesday Aug. 8th Is Proof Day, What Will Change?
Another Dairy Proof Day comes this week with the first results starting tomorrow. With new data, bulls, daughters, and TPI® Formula what will happen? A change in how stature is regarded reflects a lot of the changes you will see on Tuesday. Udder Composite and Feet and Legs Composite both now have been re-weighted to have a negative weighting in their relationship to stature. Having the penalty or negative weighting on stature is to help improve the profitability of the Holstein cow.
Protein, Fat, and Feed Efficiency have also been re-weighted in the new TPI® formula. Productive Life has been re-weighted since Cow Livabilty has been added to TPI®. Lastly Feed Efficiency has been reworked to better reflect the values used in Cheese Merit Index.
All these changes along with bulls getting new information or their first information will make it difficult to compare the April 2017 Proofs to the August 2017 Proofs. Just because a bull may rank lower doesn’t mean he really changed from April, it may just be his traits now rank lower due to the new TPI® changes.
The new bulls that are more moderate in stature, have great udders, are high Fat and Protein lbs, Feed Efficient, and long lived will be the new high TPI bulls. Stay tuned this week for reporting on all the Proof results from around the world.
(Below is the Holstein USA Press Release on TPI®)
|TPI Formula – August 2017|
Updated TPI Formula
The Holstein Association USA board of directors approved the implementation of an updated TPI formula with the August 2017 official genetic evaluation. The updated formula incorporates the following changes:
|*The value 2187 adjusts for our periodic base change, allowing TPI values to be comparable across time.|
Formula last updated April 2015
|PTAP||= PTA Protein||PTAF||= PTA Fat|
|FE||= Feed Efficiency||BWC||= Body Weight Composite|
|PL||= PTA Productive Life||LIV||= PTA Cow Livability|
|FI||= Fertility Index||DF||= STA Dairy Form|
|SCS||= PTA Somatic Cell Score||PTAT||= PTA Type|
|UDC||= Udder Composite||FLC||= Feet & Legs Composite|
|DCE||= PTA Daughter Calving Ease||DSB||= PTA Daughter Stillbirth|
|Weighting of Major Categories|
|Production||46% (Fat, Protein, Body Weight Composite, and Feed Efficiency)|
|Health & Fertility||28% (SCS, PL, LIV, FI, DCE and DSE)|
|Conformation||26% (PTAT, UDC, FLC and Dairy Form)|
|Use of the TPI Formula will lead to:|
OTHER COMPOSITE INDEXES
Feed Efficiency is the net profit a farmer receives from an increase in production. Feed Efficiency is calculated from the following information:
(Dollar Value of milk produced) – (Feed costs of extra milk) – (Extra maintenance costs)
Dollar Value of milk produced is based upon the 2017 Cheese Merit $ information from USDA-AGIL. Feed costs are the increased cost of feed per lactation that is eaten by higher producing cows. Maintenance costs are associated with body maintenance based upon the National Research Council plus increased housing costs minus income from heavier calf weights. Body weight is predicted from HAUSA classification data. The formula was developed as a part of the USDA multi-state research project on feed efficiency and a cooperative project with researchers at the University of Wageningen in the Netherlands.
FE = (-.0187 x Milk) (1.28 x Fat) (1.95 x Protein) – (12.4 x BWC)
Fertility Index (FI)
The Fertility Index combines several reproductive components into one overall index: ability to conceive as a maiden heifer, ability to conceive as a lactating cow, and a cow’s overall ability to start cycling again, show heat, conceive, and maintain a pregnancy. The Fertility Index is derived from the formula:
FI = 18% Heifer Conception Rate (HCR) 18% Cow Conception Rate (CCR) 64% Daughter Pregnancy Rate (DPR)
Breeding cows based on the updated TPI formula results in more profit, efficiency, and fertility. It impacts dairy producers’ bottom lines today, while the genetic superiority expressed by these cows will be passed onto the next generation.
Holstein USA Press Release
The board of directors of Holstein Association USA at its recent meeting approved several recommendations made by the Genetic Advancement Committee regarding the Udder Composite, Feet and Legs Composite and TPI® formula.
Following is a summary of the approved recommendations, which are targeted for implementation with the August official genetic evaluation:
• The traits included in the Udder Composite and Feet and Legs Composite have been updated as well as their weighting in the respective formulas, to reflect maximum economic returns. Of note, a negative weighting on STA Stature has been added to both of those composites to lower their relationship with stature, in response to concerns from the industry.
• Several updates will be made to the TPI formula in August, including incorporating the updated composites as noted above. Other notable changes are updating the weighting of Protein, Fat and Feed Efficiency in the formula; adding the trait Cow Livability to the formula and moving some emphasis from Productive Life to Cow Livability; and updating the economic values used in Feed Efficiency to reflect those used in the Cheese Merit index.
• The name of Body Size Composite will be changed to Body Weight Composite to more accurately reflect what the index is meant to predict. No other changes are being made to that composite other than the name.
More detailed information about these changes will be forthcoming and available on the Holstein Association USA website.
Tuesday Aug. 8th Is Proof Day, What Will Change?