Usda dairy goat genetic evaluation program status and plans
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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.

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USDA Dairy Goat Genetic Evaluation Program Status and Plans

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Usda dairy goat genetic evaluation program status and plans

USDA Dairy Goat Genetic Evaluation ProgramStatus and Plans


Usda dairy goat evaluations

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

Data Flow

Milk Data collected monthly

COMPONENT TEST LAB

FARM

DHIA

DRPC

ADGA

INTERNET

AIPL


Does contributing data from test day nearest june 30 th 2002 by processing center

Does Contributing Data from Test Day Nearest June 30th, 2002 By Processing Center


Most frequent errors for kiddings in 2002

Most Frequent Errors For Kiddings in 2002


Genetic improvement program

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

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

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

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

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.


Recent type appraisal data

Recent Type Appraisal Data


Type trait genetic correlations

Type Trait Genetic Correlations


Accuracy of evaluations

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

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

Longevity Genetic CorrelationsDairy Cattle Program


Aipl web services

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

Get goat pedigree and yield information

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


Get goat pedigree and yield information output

Get goat pedigree and yield information - output


Get yield and type evaluation

Get yield and type evaluation

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


Get yield and type evaluation output

Get yield and type evaluation - output


Get goat error records by herd output

Get goat error records by herd - output

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


Get goat error records by herd output1

Get goat error records by herd - output


Additional aipl web resources

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

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

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

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


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