Data/hora: 14/06/2024 01:41:31

Biblioteca(s): 	Embrapa Arroz e Feijão.	
Data corrente: 	17/03/1999	
Data da última atualização: 	23/09/2021	
Autoria: 	BRESEGHELLO, F.; MORAIS, O. P. de; RANGEL, P. H. N.	
Afiliação: 	FLAVIO BRESEGHELLO, CNPAF; ORLANDO PEIXOTO DE MORAIS, CNPAF; PAULO HIDEO NAKANO RANGEL, CNPAF.	
Título: 	A new method to estimate genetic gain in annual crops.	
Ano de publicação: 	1998	
Fonte/Imprenta: 	Genetics and Molecular Biology, v. 21, n. 4, p. 551-555, 1998.	
DOI: 	https://doi.org/10.1590/S1415-47571998000400024	
Idioma: 	Inglês	
Conteúdo: 	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.	
Thesagro: 	Genética; Melhoramento genético vegetal.	
Categoria do assunto: 	G Melhoramento Genético	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/122712/1/upc.pdf	
Registro original: 	Embrapa Arroz e Feijão (CNPAF)	
Exemplares: 	CNPAF - (14320-1) - UPC - AP - DD - 1998 -  - 1998 - DIS