Usda dairy goat genetic evaluation program status and plans
Download
1 / 26

USDA Dairy Goat Genetic Evaluation Program - PowerPoint PPT Presentation


  • 368 Views
  • Updated On :

USDA Dairy Goat Genetic Evaluation Program Status and Plans. USDA Dairy Goat Evaluations. Evaluations for milk, fat, protein, and type Yield evaluations in July Type evaluations in December Evaluations provided to ADGA, DRPC, and publicly via the internet. Data Flow.

Related searches for USDA Dairy Goat Genetic Evaluation Program

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'USDA Dairy Goat Genetic Evaluation Program' - daniel_millan


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

Usda dairy goat evaluations l.jpg
USDA Dairy Goat Evaluations

  • Evaluations for milk, fat, protein, and type

  • Yield evaluations in July

    Type evaluations in December

  • Evaluations provided to ADGA, DRPC, and publicly via the internet


Data flow l.jpg
Data Flow

Milk Data collected monthly

COMPONENT TEST LAB

FARM

DHIA

DRPC

ADGA

INTERNET

AIPL



Most frequent errors for kiddings in 2002 l.jpg
Most Frequent Errors For Kiddings in 2002


Genetic improvement program l.jpg
Genetic Improvement Program

Phenotype = Genotype + Environment

  • Genetic improvement programs only change genotype

  • Heritability is the portion of total variation due to genetics

  • Rate of genetic improvement determined by

    • generation interval

    • selection intensity

    • heritability


Issues affecting value of data l.jpg
Issues Affecting Value of Data

  • Completeness of ID and parentage reporting

  • Years herd on test

  • Size of herd

  • Frequency of testing and component determination


Evaluation calculation l.jpg
Evaluation Calculation

  • Goal

    • predict productivity of progeny

  • Method

    • separate genetic component from other factors influencing evaluated traits

  • All relationships are considered

    • bucks receive evaluations from the records on their female relatives


Yield evaluation model l.jpg
Yield Evaluation Model

MODEL: y = hys + hs + pe + a + e

y = yield of milk, fat, or protein during a lactation

hys = herd-year-season

- accounts for environmental effects common to does kidding in the same herd in the same season

hs = herd-sire

- effect common to daughters of a buck in the same herd

pe = permanent environment

- effect common to all a doe's lactations that is not genetic

a = animal genetic effect (breeding value)

e = unexplained residual


Type evaluation model l.jpg
Type Evaluation Model

MODEL: y = h + a + p + e

y = adjusted type record

h = herd appraisal date

a = animal genetic effect (breeding value)

p = permanent environment

- effect common to all a doe's lactations that is not genetic

e = unexplained residual

Multi-trait evaluation allows scores from one trait to affect the evaluation of another trait through the genetic correlations among the traits.




Accuracy of evaluations l.jpg
Accuracy of Evaluations

  • Number of does kidding in same hys

    more records  better estimate of hys effect

  • Number of bucks with daughters having records in same hys

    more direct comparisons  better ranking of bucks

  • Number of lactation records

  • Number of daughters

  • Accuracy of pedigree data


Longevity evaluation dairy cattle program l.jpg
Longevity Evaluation Dairy Cattle Program

Productive Life (PL)

  • Number of months in milk up to:

    • 10mo per lactation

    • 84mo in age

  • Estimated for cows still in milk

  • Reliability increased using correlated traits:

    • type composites

    • yield traits


Longevity genetic correlations dairy cattle program l.jpg
Longevity Genetic CorrelationsDairy Cattle Program


Aipl web services l.jpg
AIPL Web Services

http://aipl.arsusda.gov/query/public/tdb.shtml#GoatsTBL

  • Queries provide display of:

    • pedigree information

    • yield records

    • herd test characteristics

    • genetic evaluations of does & bucks

      • yield

      • Type

  • Access information using:

    • ID number

    • animal name

    • herd code


Get goat pedigree and yield information l.jpg
Get goat pedigree and yield information

http://aipl.arsusda.gov/cgi-bin/general/Qpublic/do.Q.cgi?qname=shgoat&single



Get yield and type evaluation l.jpg
Get yield and type evaluation

http://aipl.arsusda.gov/cgi-bin/general/Qpublic/do.Q.cgi?qname=getbuck&single



Get goat error records by herd output l.jpg
Get goat error records by herd - output

http://aipl.arsusda.gov/cgi-bin/general/Qpublic/do.Q.cgi?qname=goatherderr&single



Additional aipl web resources l.jpg
Additional AIPL Web Resources

http://aipl.arsusda.gov/docs/goatsfs.html

  • Documentation of evaluation process

    • Data requirements

    • Statistical models

    • Trait definitions

      http://aipl.arsusda.gov/links.html

  • Links to other resources including DHI, DRPC, and ADGA


Recent changes l.jpg
Recent Changes

  • New web query for accessing data by animal name

  • Yield data since 1998 extracted from the master file each run

    • incorporates corrections, deletions, and ID changes


Future plans l.jpg
Future Plans

  • Move calculations of goat evaluations to new computer

    • Possible use of dairy cattle programs

  • Add Productive Life and somatic cell score evaluations for goats

    • Value to producers

    • Staff resources required


Test day model l.jpg
Test Day Model

  • Test day replaces lactation yield in evaluation model

  • Advantages

    • Improved accounting of environmental effect

    • Allows for genetic differences in persistency and rate of maturity

  • Impeded by Cornell Research Foundation Patent

    • Currently challenged in Canada and EU

    • No licensing agreement has been reached


ad