Repeatability of agronomic characters in Brachiaria brizantha cultivars
This experiment was carried out with the objectives of determining repeatability coefficients, the number of harvests necessary to increase accuracy and the genotypic stability of yield characteristics in Brachiaria brizantha cultivars in the northeast region of Brazil in the period from July 2009 t...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Zootecnia
2013-01-01
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| Series: | Revista Brasileira de Zootecnia |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000100005 |
| _version_ | 1818925082886537216 |
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| author | Janaina Azevedo Martuscello Thiago Gomes dos Santos Braz Liana Jank Daniel de Noronha Figueiredo Vieira da Cunha Madson Williame Melo Souza Gerlane Ferreira de Brito Leandro Pereira de Oliveira |
| author_facet | Janaina Azevedo Martuscello Thiago Gomes dos Santos Braz Liana Jank Daniel de Noronha Figueiredo Vieira da Cunha Madson Williame Melo Souza Gerlane Ferreira de Brito Leandro Pereira de Oliveira |
| author_sort | Janaina Azevedo Martuscello |
| collection | DOAJ |
| description | This experiment was carried out with the objectives of determining repeatability coefficients, the number of harvests necessary to increase accuracy and the genotypic stability of yield characteristics in Brachiaria brizantha cultivars in the northeast region of Brazil in the period from July 2009 to March 2011. The experimental design used was completely randomized with three treatments (Brachiaria brizantha var. Marandu, Xaraés and Piatã) and three replications. Each plot was harvested seven times: five in the rainy season and two in the dry season. Immediately after each harvest, the forage was weighed and dried to obtain total, stem, leaf and dead dry matter yields. For the estimation of the repeatability coefficient, analysis of variance, principal components (correlation and covariance matrices) and structural analyses were used. The repeatability coefficients (r) obtained by the different methods, for all characteristics evaluated, varied from 0.009 to 0.837. The estimates of the repeatability coefficients obtained for all characteristics evaluated by the method of analyses of variance were almost always lower than those obtained by the other methods. By the principal components method (based on the covariance matrix), the estimates were always higher than those from other methods. Considering that levels of 80 or 90% confidence are satisfactory in the evaluation of the relative superiority of the cultivars for all the evaluated characteristics, with the exception of dead matter yield, the seven harvests are sufficient for the choice of the best cultivar to be used in the northeast region of Brazil. |
| first_indexed | 2024-12-20T02:35:34Z |
| format | Article |
| id | doaj.art-c41c735c551944cbaf9274256a03c0a9 |
| institution | Directory Open Access Journal |
| issn | 1516-3598 1806-9290 |
| language | English |
| last_indexed | 2024-12-20T02:35:34Z |
| publishDate | 2013-01-01 |
| publisher | Sociedade Brasileira de Zootecnia |
| record_format | Article |
| series | Revista Brasileira de Zootecnia |
| spelling | doaj.art-c41c735c551944cbaf9274256a03c0a92022-12-21T19:56:27ZengSociedade Brasileira de ZootecniaRevista Brasileira de Zootecnia1516-35981806-92902013-01-014213035Repeatability of agronomic characters in Brachiaria brizantha cultivarsJanaina Azevedo MartuscelloThiago Gomes dos Santos BrazLiana JankDaniel de Noronha Figueiredo Vieira da CunhaMadson Williame Melo SouzaGerlane Ferreira de BritoLeandro Pereira de OliveiraThis experiment was carried out with the objectives of determining repeatability coefficients, the number of harvests necessary to increase accuracy and the genotypic stability of yield characteristics in Brachiaria brizantha cultivars in the northeast region of Brazil in the period from July 2009 to March 2011. The experimental design used was completely randomized with three treatments (Brachiaria brizantha var. Marandu, Xaraés and Piatã) and three replications. Each plot was harvested seven times: five in the rainy season and two in the dry season. Immediately after each harvest, the forage was weighed and dried to obtain total, stem, leaf and dead dry matter yields. For the estimation of the repeatability coefficient, analysis of variance, principal components (correlation and covariance matrices) and structural analyses were used. The repeatability coefficients (r) obtained by the different methods, for all characteristics evaluated, varied from 0.009 to 0.837. The estimates of the repeatability coefficients obtained for all characteristics evaluated by the method of analyses of variance were almost always lower than those obtained by the other methods. By the principal components method (based on the covariance matrix), the estimates were always higher than those from other methods. Considering that levels of 80 or 90% confidence are satisfactory in the evaluation of the relative superiority of the cultivars for all the evaluated characteristics, with the exception of dead matter yield, the seven harvests are sufficient for the choice of the best cultivar to be used in the northeast region of Brazil.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000100005forage breedingforage productionselection |
| spellingShingle | Janaina Azevedo Martuscello Thiago Gomes dos Santos Braz Liana Jank Daniel de Noronha Figueiredo Vieira da Cunha Madson Williame Melo Souza Gerlane Ferreira de Brito Leandro Pereira de Oliveira Repeatability of agronomic characters in Brachiaria brizantha cultivars Revista Brasileira de Zootecnia forage breeding forage production selection |
| title | Repeatability of agronomic characters in Brachiaria brizantha cultivars |
| title_full | Repeatability of agronomic characters in Brachiaria brizantha cultivars |
| title_fullStr | Repeatability of agronomic characters in Brachiaria brizantha cultivars |
| title_full_unstemmed | Repeatability of agronomic characters in Brachiaria brizantha cultivars |
| title_short | Repeatability of agronomic characters in Brachiaria brizantha cultivars |
| title_sort | repeatability of agronomic characters in brachiaria brizantha cultivars |
| topic | forage breeding forage production selection |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000100005 |
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