Data/hora: 04/06/2024 07:47:42

Provedor de dados: | 74
País: | Brazil
Título: | A new method to estimate  genetic gain in annual crops
Autores: | Breseghello,Flávio; Morais,Orlando Peixoto de; Rangel,Paulo Hideo Nakano.
Data: | 1998-12-01
Ano: | 1998
Resumo: | The genetic gain obtained by breeding programs to improve quantitative traits may be estimated by using data from regional trials. A new statistical method for this estimate is proposed and includes four steps: a) joint analysis of regional trial data using a generalized linear model to obtain adjusted genotype means and covariance matrix of these means for the whole studied period; b) calculation of the arithmetic mean of the adjusted genotype means, exclusively for the group of genotypes evaluated each year; c) direct year comparison of the arithmetic means calculated, and d) estimation of mean genetic gain by regression. Using the generalized least squares method, a weighted estimate of mean genetic gain during the period is calculated. This method permits a better cancellation of genotype x year and genotype x trial/year interactions, thus resulting in more precise estimates. This method can be applied to unbalanced data, allowing the estimation of genetic gain in series of multilocational trials.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47571998000400024
Editor: | Sociedade Brasileira de Genética
Relação: | 10.1590/S1415-47571998000400024
Formato: | text/html
Fonte: | Genetics and Molecular Biology  v.21 n.4 1998
Fonte: | info:eu-repo/semantics/openAccess