Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/38020
Title: Assessment of genetic parameters of degradability in maize grains due to indentation scores
Other Titles: Estimativas de parâmetros genéticos da degradabilidade de grãos de milho diferindo em escore de identação
Keywords: Degradabilidade ruminal
Milho - Dureza dos grãos
Maize- Grain hardness
Ruminal dry matter degradability
Issue Date: May-2011
Publisher: Escola Superior de Agricultura "Luiz de Queiroz"
Citation: DAVIDE, L. M. C.; RAMALHO, M. A. P.; FIGUEIREDO, U. J. de; SOUZA, J. C. de. Assessment of genetic parameters of degradability in maize grains due to indentation scores. Scientia Agricola, Piracicaba, v. 68, n. 3, p. 347-352, May/June 2011.
Abstract: Maize (Zea mays L.) cultivars with dent grains present higher starch and dry matter ruminal degradability than those with flint grains. This study aimed to assess genetic parameters of degradability in maize grains of different textures and to verify whether there is an association between grain indentation score and ruminal dry matter (RDM) degradability. The evaluated progenies were obtained from the cross between the varieties Cristal (flint) and Cunha (dent), previously selected for grain hardness. Progenies were evaluated for an indentation score using a visual grading scale ranging from 1 (flint) to 5 (dent). To assess the RDM degradability, 5 g were cut into halves, weighed (five grams), stored in bags made of 100% "failet" cloth and incubated for 24 h in the rumen of three ruminally cannulated cows. There was genetic variability for RDM degradability and heritability was 46%, indicating the possibility of success using a selection. There was no association between indentation score and RDM degradability percentage; thus, visual evaluation not always reflects grain hardness per se since it indicates the pericarp aspect but not the endosperm constitution.
URI: http://repositorio.ufla.br/jspui/handle/1/38020
Appears in Collections:DBI - Artigos publicados em periódicos



This item is licensed under a Creative Commons License Creative Commons