ETA, PTI, PTA

Discussion in 'Dairy Goat Info' started by Katarina, Nov 5, 2007.

  1. Katarina

    Katarina New Member

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    English, please? Maybe 3rd grade level if possible?
     
  2. Sondra

    Sondra New Member

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    Re: ETA, PTI, PTI

    What are you talking abt??
     

  3. Tracy in Idaho

    Tracy in Idaho New Member

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    Re: ETA, PTI, PTI

    From the ADGA genetics page --

    PTI

    Production Type Index (PTI) is a measure combining both yield and type evaluations into a single number. The higher the number, the more likely improvements will take place by using those genetics. PTIs will only be calculated for animals with both yield and type evaluations.

    These indexes normalize evaluation data and act as predictors of genetic transmissibility. There are 2 flavors of indexes:

    * 2:1 – production weighted over type
    * 1:2 – type weighted over production



    ETA

    The Estimated Transmitting Ability (ETA) is an index that hopes to predict the genetic potential of offspring based on the PTIs of the sire and dam (or dam’s sire). The higher the number, the more genetic potential. PTIs must be available to make this calculation.


    Tracy
     
  4. Sondra

    Sondra New Member

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    Re: ETA, PTI, PTI

    thougt ETA was Estimated Time of Arrival :/
     
  5. Sheryl

    Sheryl New Member

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    Re: ETA, PTI, PTI

    :rofl oh Sondra, you crack me up. :rofl :rofl :rofl

    Sheryl
     
  6. Katarina

    Katarina New Member

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    Re: ETA, PTI, PTI

    ah...third grade level?
     
  7. MayLOC

    MayLOC New Member

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    Re: ETA, PTI, PTI

    :rofl I thought the same thing Sondra, but was too chicken to post it as my answer last night!! :rofl
     
  8. Feral Nature

    Feral Nature New Member

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    Come on class, you know that you get extra credit for class participation...so raise those hands and don't be afraid to voice your answers. No spit wads, please.
     
  9. Katarina

    Katarina New Member

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    So I was right in my assumption...NO ONE really knows...
     
  10. Odeon

    Odeon New Member

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  11. Tracy in Idaho

    Tracy in Idaho New Member

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    Okay-- PTI is a number that is a combination of both appraisal scores and milk test info.
    The higher the number, the better chance you have of making improvements.

    In the 2:1 ratio, production is weighted over type. 1:2 is type over production. If I want to add a lot of type to my program, I look for animals with a high 1:2 number. If I am looking to add milk, I look at the 2:1 numbers. Optimally, both numbers are high.

    ETA is what you HOPE a buck will pass on, based on his sire and dam's PTI numbers. The higher the number, the greater chance for excellent offspring.

    Any better?

    Tracy
     
  12. whimmididdle

    whimmididdle Guest

    They use 3 words that tell me a lot........hope, predict, and potential.
     
  13. Tracy in Idaho

    Tracy in Idaho New Member

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    Isn't that all a breeding program is? All you can do is try to load the deck in your favor, which is what you use the numbers for.

    Tracy