Improving the stability of test day model evaluation for production traits in the Italian Holstein
Genetic evaluation for production traits in the Holstein breed in Italy is based on a Random Regression Test Day Model (RRTDM) since November 2004. More specifically the model is a multiple lactation, multiple traits RRTDM, similar to the model used in Canada for official genetic evaluation. In orde...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Group
2010-01-01
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| Series: | Italian Journal of Animal Science |
| Subjects: | |
| Online Access: | http://www.aspajournal.it/index.php/ijas/article/view/286 |
| _version_ | 1818277242816430080 |
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| author | Grazia Bramante Raffaella Finocchiaro Fabiola Canavesi Stefano Biffani |
| author_facet | Grazia Bramante Raffaella Finocchiaro Fabiola Canavesi Stefano Biffani |
| author_sort | Grazia Bramante |
| collection | DOAJ |
| description | Genetic evaluation for production traits in the Holstein breed in Italy is based on a Random Regression Test Day Model (RRTDM) since November 2004. More specifically the model is a multiple lactation, multiple traits RRTDM, similar to the model used in Canada for official genetic evaluation. In order to improve stability, data were pre-adjusted for number of days pregnancy at test day and fixed regression curve effects include now the effect of year of production, four calving seasons instead of two and a general effect for days in milk (DIM) was added. The changes in the model improved stability of proofs over time, thus increasing the ability of the test day to accurately predict the breeding value of both bulls and cows. Trend validation results showed also improvements and residuals were positively affected by the changes. Trends in trait residuals previously detected with respect to DIM and month of calving did show a significant reduction. The new model was officially introduced in January 2009. |
| first_indexed | 2024-12-12T22:58:26Z |
| format | Article |
| id | doaj.art-d337d0f3c85c49528822961f2d4ca310 |
| institution | Directory Open Access Journal |
| issn | 1594-4077 1828-051X |
| language | English |
| last_indexed | 2024-12-12T22:58:26Z |
| publishDate | 2010-01-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Italian Journal of Animal Science |
| spelling | doaj.art-d337d0f3c85c49528822961f2d4ca3102022-12-22T00:08:54ZengTaylor & Francis GroupItalian Journal of Animal Science1594-40771828-051X2010-01-0182s394110.4081/ijas.2009.s2.39Improving the stability of test day model evaluation for production traits in the Italian HolsteinGrazia BramanteRaffaella FinocchiaroFabiola CanavesiStefano BiffaniGenetic evaluation for production traits in the Holstein breed in Italy is based on a Random Regression Test Day Model (RRTDM) since November 2004. More specifically the model is a multiple lactation, multiple traits RRTDM, similar to the model used in Canada for official genetic evaluation. In order to improve stability, data were pre-adjusted for number of days pregnancy at test day and fixed regression curve effects include now the effect of year of production, four calving seasons instead of two and a general effect for days in milk (DIM) was added. The changes in the model improved stability of proofs over time, thus increasing the ability of the test day to accurately predict the breeding value of both bulls and cows. Trend validation results showed also improvements and residuals were positively affected by the changes. Trends in trait residuals previously detected with respect to DIM and month of calving did show a significant reduction. The new model was officially introduced in January 2009.http://www.aspajournal.it/index.php/ijas/article/view/286Test day model, Accuracy, Residuals, Proof stability. |
| spellingShingle | Grazia Bramante Raffaella Finocchiaro Fabiola Canavesi Stefano Biffani Improving the stability of test day model evaluation for production traits in the Italian Holstein Italian Journal of Animal Science Test day model, Accuracy, Residuals, Proof stability. |
| title | Improving the stability of test day model evaluation for production traits in the Italian Holstein |
| title_full | Improving the stability of test day model evaluation for production traits in the Italian Holstein |
| title_fullStr | Improving the stability of test day model evaluation for production traits in the Italian Holstein |
| title_full_unstemmed | Improving the stability of test day model evaluation for production traits in the Italian Holstein |
| title_short | Improving the stability of test day model evaluation for production traits in the Italian Holstein |
| title_sort | improving the stability of test day model evaluation for production traits in the italian holstein |
| topic | Test day model, Accuracy, Residuals, Proof stability. |
| url | http://www.aspajournal.it/index.php/ijas/article/view/286 |
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