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| *The value 1815, adjusts for our periodic base change, allowing TPI values to be comparable across time |
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PTAP |
= PTA Protein |
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PTAF |
= PTA Fat |
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PTAT |
= PTA Type |
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DF |
= STA Dairy Form |
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UDC |
= Udder Composite |
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FLC |
= Feet & Legs Composite |
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PL |
= PTA Productive Life |
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SCS |
= PTA Somatic Cell Score |
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DPR |
= PTA Daughter Pregnancy Rate |
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DCE |
= PTA Daughter Calving Ease |
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DSB |
= PTA Daughter Stillbirth |
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Change to TPI formula - effective January 2010
Recognizing the needs, strengths, and the opportunities that we have before us, Holstein Association USA has made a slight modification to our TPI formula. The change leads to an increase in emphasis on productive life and daughter pregnancy rate; maintains the current emphasis on udders and feet & legs; slows the increase in body size; and reduce, by a small amount, the emphasis on production. These changes coincide with the views being expressed by commercial dairy producers throughout the U.S. and abroad, helping to ensure that TPI continues to be the index of choice around the world.
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Weighting of Major Categories |
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Production |
42% |
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Health & Fertility |
33% |
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Conformation |
25% |
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The key features of the new TPI formula are as follows: |
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44% emphasis on production
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(Fat and Protein & part of PTAT)
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25% emphasis on early breeding |
(DPR, PL & DF)
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19% emphasis on udder health |
(SCS, UDC & part of PTAT) |
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7% emphasis on mobility |
(Feet & Leg composite & part of PTAT) |
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3% emphasis on calving ability |
(Daughter Calving Ease & Stillbirth) |
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2% emphasis on body size |
(part of PTAT ) |
