Bias in the prediction of genetic gain due to mass and half-sib selection in random mating populations
The prediction of gains from selection allows the comparison of breeding methods and selection strategies, although these estimates may be biased. The objective of this study was to investigate the extent of such bias in predicting genetic gain. For this, we simulated 10 cycles of a hypothetical bre...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Genética
2009-01-01
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| Series: | Genetics and Molecular Biology |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000300012 |
| _version_ | 1828160724659077120 |
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| author | José Marcelo Soriano Viana Vinícius Ribeiro Faria Admilson da Costa e Silva |
| author_facet | José Marcelo Soriano Viana Vinícius Ribeiro Faria Admilson da Costa e Silva |
| author_sort | José Marcelo Soriano Viana |
| collection | DOAJ |
| description | The prediction of gains from selection allows the comparison of breeding methods and selection strategies, although these estimates may be biased. The objective of this study was to investigate the extent of such bias in predicting genetic gain. For this, we simulated 10 cycles of a hypothetical breeding program that involved seven traits, three population classes, three experimental conditions and two breeding methods (mass and half-sib selection). Each combination of trait, population, heritability, method and cycle was repeated 10 times. The predicted gains were biased, even when the genetic parameters were estimated without error. Gain from selection in both genders is twice the gain from selection in a single gender only in the absence of dominance. The use of genotypic variance or broad sense heritability in the predictions represented an additional source of bias. Predictions based on additive variance and narrow sense heritability were equivalent, as were predictions based on genotypic variance and broad sense heritability. The predictions based on mass and family selection were suitable for comparing selection strategies, whereas those based on selection within progenies showed the largest bias and lower association with the realized gain. |
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| format | Article |
| id | doaj.art-771e6fc049a8442ba7225f2d4fb2eb4d |
| institution | Directory Open Access Journal |
| issn | 1415-4757 1678-4685 |
| language | English |
| last_indexed | 2024-04-12T00:25:38Z |
| publishDate | 2009-01-01 |
| publisher | Sociedade Brasileira de Genética |
| record_format | Article |
| series | Genetics and Molecular Biology |
| spelling | doaj.art-771e6fc049a8442ba7225f2d4fb2eb4d2022-12-22T03:55:31ZengSociedade Brasileira de GenéticaGenetics and Molecular Biology1415-47571678-46852009-01-01323497506Bias in the prediction of genetic gain due to mass and half-sib selection in random mating populationsJosé Marcelo Soriano VianaVinícius Ribeiro FariaAdmilson da Costa e SilvaThe prediction of gains from selection allows the comparison of breeding methods and selection strategies, although these estimates may be biased. The objective of this study was to investigate the extent of such bias in predicting genetic gain. For this, we simulated 10 cycles of a hypothetical breeding program that involved seven traits, three population classes, three experimental conditions and two breeding methods (mass and half-sib selection). Each combination of trait, population, heritability, method and cycle was repeated 10 times. The predicted gains were biased, even when the genetic parameters were estimated without error. Gain from selection in both genders is twice the gain from selection in a single gender only in the absence of dominance. The use of genotypic variance or broad sense heritability in the predictions represented an additional source of bias. Predictions based on additive variance and narrow sense heritability were equivalent, as were predictions based on genotypic variance and broad sense heritability. The predictions based on mass and family selection were suitable for comparing selection strategies, whereas those based on selection within progenies showed the largest bias and lower association with the realized gain.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000300012predicted genetic gainrealized genetic gainrecurrent selection |
| spellingShingle | José Marcelo Soriano Viana Vinícius Ribeiro Faria Admilson da Costa e Silva Bias in the prediction of genetic gain due to mass and half-sib selection in random mating populations Genetics and Molecular Biology predicted genetic gain realized genetic gain recurrent selection |
| title | Bias in the prediction of genetic gain due to mass and half-sib selection in random mating populations |
| title_full | Bias in the prediction of genetic gain due to mass and half-sib selection in random mating populations |
| title_fullStr | Bias in the prediction of genetic gain due to mass and half-sib selection in random mating populations |
| title_full_unstemmed | Bias in the prediction of genetic gain due to mass and half-sib selection in random mating populations |
| title_short | Bias in the prediction of genetic gain due to mass and half-sib selection in random mating populations |
| title_sort | bias in the prediction of genetic gain due to mass and half sib selection in random mating populations |
| topic | predicted genetic gain realized genetic gain recurrent selection |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000300012 |
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