Using epds in selection
This presentation is the property of its rightful owner.
Sponsored Links
1 / 16

Using EPDs in Selection PowerPoint PPT Presentation


  • 94 Views
  • Uploaded on
  • Presentation posted in: General

Using EPDs in Selection. Edited by: Jessica Hawley & Brandon Freel Originally compiled by Colorado Agriscience Curriculum. Define Expected Progeny Difference. Interpret EPD categories. Analyze EPD variations within breeds. Recognize the importance of EPD use in selection.

Download Presentation

Using EPDs in Selection

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Using epds in selection

Using EPDs in Selection

Edited by: Jessica Hawley & Brandon Freel

Originally compiled by Colorado Agriscience Curriculum


Objectives

  • Define Expected Progeny Difference.

  • Interpret EPD categories.

  • Analyze EPD variations within breeds.

  • Recognize the importance of EPD use in selection.

  • Apply EPD concepts.

    EPD Video

Objectives


Selection of livestock

Selection of livestock

Two Ways

Phenotype – The appearance of an animal.

Genotype – What genes are present and how they are combined.


Breeding values

Breeding Values

(EPD) ExpectedProgenyDifference – A measurement of genetic potential based on the performance of relatives.

(ACC) Accuracy is an important term used in understanding EPDs. It is a measure of expected change in the EPD as additional young are born to the sire. A high accuracy value is better as the chances of the EPD being correct rise.


Common epd s

Common EPD’s

Common EPDs: Performance-based, Carcass-based, and Ultrasound.

Performance-basedEPDs – Are based on a measurement of how well the bull’s offspring perform. Examples of performance-based EPDs are birth weight, weaning weight, milk and yearling weight.

Carcass-based – Are based on how well the bull’s offspring have performed on the rail. Examples of carcass-based EPDs are Rib-eye Area, Fat (Outer), Retail Product, and % Intramuscular Fat.

UltrasoundEPDs – Done from an ultrasound of the actual bull. Examples of ultrasound EP’s are Rib-eye Area, Fat (Outer), and % Retail Product.


How to compare epds

How to Compare EPDs

  • How much more will Bull B weigh at birth than Bull A?

  • Answer: .6 pounds.

    • How much more will bull A weigh at weaning than Bull B?

  • Answer: 11 pounds

    • Which bull would be a better bull for heifers?

  • Answer: Both would be fine. But smaller calves would come from A.

    • Which bull has a bigger Rib-eye Area?

  • Answer: Bull B


  • Selection of cattle

    Selection of Cattle

    Should include both visual and genetic appraisal

    Valuable genetic traits

    Depends on producers goal

    Culling – Cows should be culled from the herd based on the productivity of their calves.

    Evaluation – Cows should be culled based on evaluation of the udders, eyes, skeleton and teeth.


    Selection of heifers

    Selection of Heifers

    Try to select heifers that will conceive early in the breeding season, calve easily, produce a good supply of milk, wean a heavy calf, make a desirable genetic contribution to your cow herd, and have calves with desirable carcass traits.


    Accuracy and herd epd s

    Accuracy and Herd EPD’s

    Accuracy - The reliability that can be placed on the EPD. Accuracy of close to 1.0 indicates higher reliability.

    Herd- Indicate the number of herds from which daughters are reported.


    Birth weight

    BirthWeight

    Predictor of a sire’s ability to transmit birth weight to his progeny, compared to the progeny of an average bull for a specific breed; expressed in pounds.


    Weaning weight

    WeaningWeight

    Predictor of a sire's ability to transmit weaning growth to his progeny, compared to the progeny of an average bull for a specific breed; expressed in pounds.


    Yearling weight

    Yearling Weight

    Predictor of a sire's ability to transmit yearling weight, compared to the progeny of an average sire for a specific breed; expressed in pounds.


    Maternal milk

    Maternal Milk

    Predictor of a sire's genetic merit for that part of weaning weight attributed to milk and mothering ability. It is compared to daughters of an average bull for a specific breed.


    Scrotal circumference

    Scrotal Circumference

    Predictor of the difference in transmitting ability for scrotal size, compared to the progeny of an average bull for a specific breed; expressed in centimeters.


    Using epds in selection

    • You are a rancher looking to improve your herd overall. This requires you to look at all traits and choose the bull you think will offer the most multi-trait excellence. Please right a paragraph discussing why you chose a specific bull.


    Objectives1

    • Define Expected Progeny Difference.

    • Interpret EPD categories.

    • Analyze EPD variations within breeds.

    • Recognize the importance of EPD use in selection.

    • Apply EPD concepts

    Objectives


  • Login